Pre-Slaughter Stunning Methods Influence the Meat Quality of Arapaima gigas Fillets.

The aim of this study was to evaluate the influence of different stunning methods on the meat quality of Arapaima gigas fillets from fish farming. A total of 48 specimens of A. gigas in the weight class 11.1 to 14.0 kg were investigated; these fish were subjected to different stunning methods for slaughter: ice asphyxia (IA), air asphyxia (AA), electronarcosis (EE) and hypothermia followed by bleeding (HB). Then, data were obtained from the analysis of pH, rigor mortis index (RI), water activity (Aw), instrumental texture (compression strength, firmness and adhesiveness) and blood glucose and via instrumental colourimetry. During the study, for up to 15 days of refrigerated storage, the methods provided pH values below 6.0. A. gigas submitted to EE and HB remained longer in the pre-rigor status. In addition, they expressed lower percentages of Aw. The EE method resulted in better texture assignments in the fillets. The blood glucose values indicated that the fish subjected to EE were less stressed. Concerning instrumental colourimetry, the fillets submitted to EE and HB showed greater luminosity; the fillets subjected to AA showed greater red-green colour intensity, while the fillets subjected to EE showed greater yellow-blue colour intensity. Therefore, the fish did not suffer stress with electronarcosis, and the fillets showed better preservation, juiciness, and tenderness.

Population structure and reproductive indicators of the surubim Pseudoplatystoma punctifer (Siluriformes, Pimelodidae) in the São Miguel River, Amazon basin, Brazil.

Fish is an important source of food and income for a significant portion of the Amazonian population, especially those who live along the rivers and lakes in the region. Pseudoplatystoma punctifer (Castelnau, 1855), known as surubim, is a species of Neotropical catfish widely exploited by fisheries and commercially valuable in the Guaporé River basin, Brazil. However, population dynamics are poorly known in the region. To understand the population structure and reproductive biology aspects of the surubim, monthly experimental fisheries were carried out in the São Miguel River, state of Rondônia, Brazil, between August 2020 and July 2021. The captured fish were weighed, and its gonads were removed and weighed for histological analyses (microscopic description) and classification of the maturation stages (macroscopic description). The collected gonads were fixed in 10% buffered formalin, dehydrated, cut into 4-µm-thick sections, and stained with hematoxylin and eosin. A total of 34 individuals were collected (20 females and 14 males), showing positive allometric growth and condition factor from 0.81 to 1.79 for females and males, respectively. Females were larger in size and weight than males. P. punctifer reaches its first maturation at an average length of 68.30 cm, indicating the importance of respecting the minimum capture size as an alternative to ensure the natural stocks of this fishery resource in the region. The results provide support for the establishment of public policies and actions for conservation, management, and regulation of fishing.

Cecal dilatation in cattle ingesting Megathyrsus maximus (syn. Panicum maximum) cv. Mombaça and cv. Tanzânia.

Nine outbreaks of cecal dilatation are reported in cattle in rotationally-grazed pastures of Megathyrsus maximus during the rainy season with one day grazing and rest intervals of 23-28 days. Clinical signs, observed 6-24 h after entering the pasture, were inappetence, long periods in sternal recumbency, rough hair coat, arched back, tenesmus with difficult defecation, dry stools, reduced ruminal movements, intestinal tympany with right abdominal distention, and decreased milk production. The animals recovered 8-12 h after their removal from the pastures. All pastures were fertilized at 80-120 kg/ha of urea/year. In six farms, in addition to urea, chicken litter (CL) was also added. Water-soluble carbohydrates (WSC), non-fiber carbohydrates (NCF) and starch concentrations in the pastures causing tympany were higher (P < 0.05) than in control pastures. To demonstrate the relationship of the disease with fertilization of the pastures, a pasture of M. maximus was divided into five blocks of 16 m2 and each block subdivided into four plots each, totaling 20 plots. One plot of each block was randomly chosen for 1 of 4 different treatments: 1. fertilized with 8 t/ha of CL; 2. fertilized with 16 t/ha of CL; 3. fertilized with 180 kg/ha urea; 4. control without fertilization. In general, plots fertilized with urea or with CL had higher NFC and starch concentrations (p < 0,05) than the control plots. In another experiment a pasture of M. maximus was divided into 23 paddocks and rotationally grazed. Ten paddocks were fertilized with 180 kg/ha of urea and five fertilized with 8 t/ha of CL. The concentration of NFC and starch were significantly higher (p < 0.05) in the pastures fertilized with urea and with urea plus CL. These results suggest that cecal dilatation may be caused by the high concentrations of NFC and starch in the pastures fertilized with urea and/or poultry litter.

Monitoring of Mycotoxigenic Fungi in Fish Farm Water and Fumonisins in Feeds for Farmed Colossoma macropomum.

This study aimed to evaluate the occurrence of mycotoxigenic fungi in fish farm water and mycotoxins in feeds for farmed tambaqui (Colossoma macropomum). A total of 40 samples of freshwater from fish farms and 16 samples of feed were collected and analyzed for microbiology. A total of five species of free-living fungi were identified in fish farms: Aspergillus fumigatus, Penicillium citrinum, P. implicatum, Fusarium oxysporum and Alternaria alternata. These fungi species were counted in water samples at 35.14 CFU mL-1 and 24.69 CFU mL-1 in the dry seasons. In all fish farms, there was a higher abundance of fungi species in the rainy season. During visits to the fish farmers, it was possible to verify poor feed storage conditions. Concerning mutations in blood cells, in tambaqui (C. macropomum), a total of 159 anomalies were found, and in Leptodactylus petersii, 299 anomalies were found, with higher incidences in conditions above 1.0 CFU mL-1 in log10(x+1) fungi and in the rainy season. The occurrence of mycotoxicological contamination was confirmed in 81.25% of the analyzed samples. The quantified mycotoxin was Fumonisins B1 + B2 (375 to 1418 µg kg-1). Pearson's correlation analysis showed a significant positive correlation between Fumonisins and feed samples (r = 0.83). There was also a significant positive correlation between the abundance of fungi in water and the quantification of Fumonisins (r = 0.79). Based on the results obtained, it can be concluded that free-living fungi can be used as bioindicators of water quality in fish farms. Consequently, the lack of good management practices caused microbiological contamination of the aquatic environment.

First monitoring of cyanobacteria and cyanotoxins in freshwater from fish farms in Rondônia state, Brazil.

The main aimed of this study was to evaluate the physicochemical parameters, abundance and density of cyanobacteria, determine their blooms and the ecotoxicological risk of their cyanotoxins in fish ponds water. This study was conducted out in 20 fish farms in Rondônia state (Brazilian Amazon), samplings were carried out in the rainy and dry seasons. The experiment was developed in a completely randomized factorial design 20 × 3 x 3 (20 fish farms, 3 ponds and 3 replications). Regarding the composition of qualitative samples, horizontal and vertical hauls were carried out on the water surface, quantitative samples was obtained using a plankton net (50 µm mesh opening). Meanwhile, with the use of a multiparametric probe, physicochemical analyzes in fish ponds water were carried out. Furthermore, the cyanobacteria found were classified taxonomically and its blooms were recorded. Finally, blood was collected from 60 Colossoma macropomum. Concerning the higher averages in the rainy season 6.13 mg L⁻1 of dissolved oxygen, 40.02 cm of transparency, 0.35 NO31⁻ of nitrate, 0.15 NO21⁻ of nitrite, 44.55 mg L⁻1 CaCO3 of alkalinity and 50.10 mg L⁻1 CaCO3 of hardness, while higher averages of pH, phosphate and phosphorus were found in the dry season. A total of 15 families and 29 species of cyanobacteria were identified in the different seasons. The families that showed the highest densities (rainy and dry seasons) were Microcystaceae (356 and 760 cells mL⁻1), Leptolyngbyaceae (126 and 287 cells mL⁻1) and Microcoleaceae (111 and 405 cells mL⁻1). The species that showed the highest densities were Microcystis aeruginosa (356 and 697 cells mL⁻1), Planktolyngbya limnetica (98 and 257 cells mL⁻1) and Planktothrix sp. (111 and 239 cells mL⁻1). There were significant Pearson's correlations (r > 0.85; p < 0.05) between family abundances and cyanotoxin volume between physicochemical water variables and seasonality. A total of 20 cyanobacteria blooms were recorded, all of which in the dry season showed an ecotoxicological risk. Concerning the assessment mutagenicity in fish blood cells, a total of 78 abnormalities per slide were observed. In the dry season, the expected volume of cyanotoxins in the ponds from fish farms F1 and F4 were above the quantification limit (>QL). Abundance and density of cyanobacteria and their blooms and cyanotoxins can be used as bioindicators of eutrophication and/or water quality and ecotoxicological risk in fish ponds.

First evidence of microplastics in freshwater from fish farms in Rondônia state, Brazil.

The main aimed of this study was to provide information on microplastics present in the freshwater of fish farm ponds. In addition, the study showes a relationship between the seasonal, spatial distribution and the amount of microplastics found. This study was conducted in 35 fish farms located in the Rondônia state, Brazil, the sample collects were carried out in the two Amazonian hydrological seasons (dry and rainy). The study was developed in a completely randomized factorial scheme 35 × 3 x 3 (35 fish farms, 3 ponds and 3 repetitions per ponds). Microplastic sampling was performed following a modified method based on National Oceanic and Atmospheric Administration (NOAA). Samples of 250 mL freshwater collected, which were deionized and pre-filtered through 6.0 mm mesh granulometric sieves. The average abundances of the different hydrological seasons were compared by Student's t-test, with differences statistically significant at p < 0.05. The microplastics were morphological categorized into fibers and colors blue, red or transparent. Microplastic contamination was confirmed in freshwater of 9 fish farming, with greater abundance of blue fibers and greater quantification in the rainy season. Fish farms P3, P4 and P6 had the highest quantifications of blue fiber in the two seasons (6 and 43, 19 and 56, 11 and 88 items mL-1, respectively). Almost all fish farms had a higher abundance of microplastics in the rainy season. It is important to highlight the prominence of microplastics in the blue fiber rainy season (286 items mL-1) compared to the dry season (58 items mL-1). Fish farms P3, P4 and P6 showed a strong positive correlation between the factors distance from the nearest urban area (r = 0.94, 0.79 and 0.97, respectively) and seasonality (r = 0.98, 0.77 and 0.96, respectively). Rainfall variations influenced the abundance of microplastics, especially of blue fibers. Fish farms are supplied with fresh water by rivers or streams, so it is possible that microplastics originate outside the fish farm, perhaps they were introduced due to high soil occupation, although surface runoff (of water contaminated by sewage) caused by heavy rains the most important factor. Therefore, one factor must be considered, surface runoff and groundwater contaminated by urban, agricultural and urban effluents may have contaminated rivers and streams and then contaminated the water in the fish farm ponds.

Quality of Oreochromis niloticus and Cynoscion virescens fillets and their by-products in flours make for inclusion in instant food products.

The production of fish flour is an alternative for better use of the raw material, although it is rarely used in instant food. Thus, the aimed of this study was to evaluate Oreochromis niloticus (Nile tilapia) and Cynoscion virescens (croaker) fillets and the elaboration of flour with filleting by-products for inclusion in food products. Carcasses and heads of the two fish species were cooked, pressed, ground, subjected to drying and re-grinding to obtain standardized flours. These carcass flours were seasoned (sweet and salted). This study was organized into two experimental tests: Test 1: Yield, physicochemical and microbiological analyzes of fillets and flours made from carcass and head of Nile tilapia and croaker; Test 2: Seasoned flours made from Nile tilapia carcasses. There was a difference in fillets yield, where the croaker demonstrated 46.56% and the Nile tilapia 32.60%. Nile tilapia fillets had higher protein content (17.08%) and lower lipid content (0.89%) compared to croaker fillets (14.21 and 4.45%). Nile tilapia backbone flour had the highest protein content (55.41%) and the croaker the highest ash (45.55%) and the lowest Nile tilapia (28.38%). The head flours had lower protein contents (39.86%). Flours produced with croaker backbone had higher levels of calcium and phosphorus (9.34 and 9.27%). However, Nile tilapia backbone flour showed higher contents of essential amino acids. These flours demonstrated a fine granulometry (0.23 to 0.56 mm). Seasoned flours demonstrated interaction between fish species and flavors for moisture, ash, carbohydrates, calcium and phosphorus. The highest protein content (29.70%) was for Nile tilapia flour sweet flours (31.28%) had higher protein content, while salted lipids (8.06%). Nile tilapia has a lower fillet yield, although with a high protein content and low lipid content. Comparing the flours made from filleting by-products, the backbone flour has better nutritional quality, with Nile tilapia being superior to that of croaker, especially in terms of protein and amino acids.

Characterization and Strength Quality of the Oryctolagus cuniculus Leather Compared to Oreochromis niloticus Leather.

This study aimed to compare the resistance of the Oryctolagus cuniculus L. (rabbit) and Oreochromis niloticus L. (Nile tilapia) skins, as well as to observe the design of the flower of these skins and the morphology of the dermis. Tilapia and rabbit skins were placed inside the same equipment (tannery machine) for the chromium salt tanning process. The flower design of the fish leather distinguishes it from the rabbit leather, the latter being constituted by the opening of the hair follicles and pores, while the fish leather is constituted by the presence of protective lamellae and insertion of the scales. The dermis of rabbit skin consists of thick bundles of collagen fibers arranged in all directions, which differs from the morphology observed in the dermis of fish skin. However, in the Nile tilapia skin dermis, overlapping and parallel layers of longitudinal collagen fiber bundles are observed, these layers are interspersed with fiber bundles crossing the sking surface (transversely), tying the fibers together and providing greater strength, which can be proven by the strength test. The fish leathers, despite having less thickness (1.0 mm), demonstrated significantly greater tensile strength (13.52 ± 1.86 N mm-2) and tear strength (53.85 ± 6.66 N mm-2) than rabbit leathers, that is, (8.98 ± 2.67 N mm-2) and (24.25 ± 4.34 N mm-2). However, rabbit leather demonstrated higher elasticity (109.97 ± 13.52%) compared to Nile tilapia leather (78.97 ± 8.40%). It can be concluded that although the rabbit leather is thicker due to the histological architecture of the dermis (thick bundles of collagen fibers arranged in all directions with no pattern of organization of collagen fibers), it shows less resistance than Nile tilapia leather, which demonstrates an organization of overlapping and parallel layers and intercalating collagen fiber bundles transversally to the surface, functioning as tendons for the swimming process. It is recommended to use a piece of fabric (lining) together with the fleshy side of the rabbit leather, to increase resistance when used in clothing and footwear, as these products require greater tensile strength. Thus, it minimizes this restriction for the use of rabbit leather in the aforementioned purposes.

Immunological and biossensory techniques for detection of Salmonella spp. in food derived from fish farming- review / Técnicas imunológicas e biossensoriais para detecção de Salmonella spp. em alimentos derivados da piscicultura ­ revisão de literatura / Técnicas inmunológicas y biosensoriales para detección de Salmonella spp. en alimentos derivados de piscicultura - revisión de literatura

Salmonellosis is the world's most common foodborne illness. In Brazil, foods contaminated by salmonella lead the statistics. Therefore, the aim of this study is, through biotechnological knowledge, to compile alternative and innovative techniques for the detection of salmonella in foods, such as fish-farming derivatives, immunological and biosensorial techniques. This is a descriptive exploratory data survey of a qualitative nature, aiming at data analysis. Research and data collection were carried out in bibliographic databases: Academic Google, Scielo, CAPES journals and institutional repositories using specific descriptors - in Portuguese and English, with words and terms separated by the Boolean operators 'AND' and 'OR'. Some innovative and alternative methods are available to identify the presence of salmonella in food. Immunological and biosensory techniques, despite being less frequent in the scientific literature than molecular methods, are techniques that present high specificity and sensitivity. These techniques have been the most developed alternative methods in fish in recent years. And, they can employ both molecular and immunological techniques in biorecognition, which is characterized as an advantage of not having a requirement for pre-enrichment of the sample. According to the literature found, the techniques covered in this study are quick to respond, which speeds up decision-making by researchers and technicians, which makes the techniques very promising for industrial application.(AU)

A salmonelose é uma enfermidade de maior ocorrência no mundo veiculada por alimentos. No Brasil, alimentos contaminados por salmonelas lideram as estatísticas. Por isso, o objetivo desse estudo é através dos conhecimentos biotecnológicos compilar técnicas alternativas e inovadoras para a detecção de salmonelas em alimentos, como os derivados da piscicultura, as técnicas imunológicas e biossensoriais. Trata-se de um estudo de levantamento de dados descritivo exploratório de de caráter qualitativo, visando à análise dos dados. As pesquisas e coletas de dados foram realizadas nas bases bibliográficas: Google Acadêmico, Scielo, periódicos da CAPES e repositórios institucionais utilizando os descritores específicos - nos idiomas português e inglês, com palavras e termos separados pelos operadores booleanos 'AND' e 'OR'. São disponibilizados alguns métodos inovadores e alternativos para identificação da presença de salmonelas em alimentos. As técnicas imunológicas e biossensoriais, apesar de serem menos frequentes na literatura científica do que os métodos moleculares são técnicas que apresentaram elevada especificidade e sensibilidade. Essas técnicas têm sido os métodos alternativos mais desenvolvidos em peixes nos últimos anos. E, podem empregar tanto técnicas moleculares como imunológicas no biorreconhecimento, o que se caracteriza como vantagem de não haver requerimento de pré-enriquecimento da amostra. Conforme a literatura encontrada, as técnicas abordadas por esse estudo apresentam rapidez de resposta o que agiliza as tomadas de decisões dos pesquisadores e técnicos, o que torna as técnicas bastante promissora para aplicação industrial.(AU)

La salmonelosis es la enfermedad transmitida por alimentos más común del mundo. En Brasil, los alimentos contaminados por salmonelas lideran las estadísticas. Por tanto, el objetivo de ese estudio fue a través de conocimientos biotecnológicos recopilar técnicas alternativas e innovadoras para la detección de salmonelas en los alimentos, como los derivados de la piscicultura, las técnicas inmunológicas y biosensoriales. Se trata de una encuesta de datos exploratorio descriptivo de carácter cualitativo, cuyo objetivo es el análisis de datos. Las investigaciones y recopilaciones de datos se realizaron en bases de datos bibliográficas: Google Académico, Scielo, revistas CAPES y repositorios institucionales utilizando descriptores específicos, en portugués e inglés, con palabras y términos separados por los operadores booleanos 'AND' y 'OR'. Se encuentran disponibles algunos métodos innovadores y alternativos para identificar la presencia de salmonela en los alimentos. Las técnicas inmunológicas y biosensoriales, a pesar de ser menos frecuentes en la literatura científica que los métodos moleculares, son técnicas de alta especificidad y sensibilidad. Esas técnicas han sido los métodos alternativos más desarrollados en peces en los últimos años. Y pueden emplear técnicas tanto moleculares como inmunológicas en el biorreconocimiento, que se caracteriza por la ventaja de no tener un requisito de preenriquecimiento de la muestra. Según la literatura encontrada, las técnicas abordadas en este estudio son de rápida respuesta, lo que agiliza la toma de decisiones por parte de investigadores y técnicos, lo que hace que las técnicas sean muy prometedoras para la aplicación industrial.(AU)

Myrciaria dubia Juice (camu-camu) Exhibits Analgesic and Antiedematogenic Activities in Mice.

The Myrciaria dubia (Myrtaceae) fruit is traditionally used to treat malnutrition due to its high levels of vitamin C and phenolic compounds. Because of its composition, this plant is very promising in the research of novel natural treatment for pain disorders. This study analyzed the phytochemical profile of M. dubia juice and assessed its antinociceptive and antiedematogenic potential. The phytochemical profile was determined through high-performance liquid chromatography (HPLC), the oral antinociceptive effect of M. dubia 50% juice (Md50) was evaluated by formalin, hot plate and Complete Freund's Adjuvant tests and the antiedematogenic activity by paw edema. HPLC revealed the presence of ascorbic acid, rutin, and ellagic acid as major compounds. Md50 showed an antinociceptive effect in the acute and chronic phases of the formalin test. In the hot plate test, Md50 also induced an antinociceptive effect of 0.5 up to 6 h, showing antinociceptive and antiedematogenic potential without changing the spontaneous locomotion of animals. All protocols were submitted and approved by the Ethics Committee for use of Animals of the Lutheran University of Brazil (protocol No. 2013-30P).

Antigenotoxic and antimutagenic effects of Myrciaria dubia juice in mice submitted to ethanol 28-day treatment.

Myrciaria dubia is a native plant from the Amazon region which produces red-purplish fruit rich in antioxidant compounds such as ascorbic acid, carotenoids, and phenolic. M. dubia fruit is used to prepare juices considered to possess high nutritional content providing health benefits. The aim of this study was to examine the ability of M. dubia juice to protect DNA against genomic instability induced by sub-acute ethanol consumption attributed to oxidative stress. Mice were treated for 28 days with juice at 25% and 50% diluted in distilled water or with the diluted combination juice plus ethanol (5 g/kg). The genotoxic/antigenotoxic and mutagenic/antimutagenic effects were assessed using comet assay in blood, liver, and kidney and micronucleus (MN) test with bone marrow. In addition, the mutagenicity was also evaluated using Salmonella/microsome assay. Phytochemical compounds were determined using HPLC/PDA/MS/MS. The juice did not induce genotoxic effects in blood, kidney, and liver cells at both doses. In combination with ethanol, the juice reduced the alcohol-mediated DNA damage in all tissues analyzed. Further, the juice did not produce mutagenic effects and decreased mutagenicity induced by ethanol in the bone marrow. The anthocyanins were major compounds detected by HPLC/PDA/MS/MS, which modulated genotoxic and mutagenic effects initiated by ethanol and at least in part appeared responsible for the observed antigenotoxic and antimutagenic effects of M. dubia juice.

Timpanismo gastrointestinal em equídeos alimentados com Panicum maximum com alto conteúdo de amido / Intestinal bloat in equids fed with Panicum maximum of high starch content

Timpanismo intestinal agudo em cavalos e mulas introduzidos em pastagens de Panicum maximum cv. Tanzânia, cv. Massai e cv. Mombaça são relatados na região norte do Brasil, durante o período das chuvas. As causas são desconhecidas, porém, tem sido sugerido que estão associados a um maior armazenamento de carboidratos não fibrosos na gramínea. Este trabalho teve por objetivos realizar um levantamento epidemiológico dos surtos de cólicas ocorridos no Estado de Rondônia, assim como contribuir com o estudo da ação dos carboidratos de P. maximum na ocorrência da doença. Para isso foram realizadas visitas em 10 propriedades que apresentaram casos da enfermidade. Em duas propriedades foram introduzidos equinos no mês de março e foram coletadas amostras de pastagens para a determinação de energia digestiva, lisina, matéria seca, carboidratos solúveis em água, carboidratos solúveis em éter, carboidratos não fibrosos, fibra de detergente neutra, fibra de detergente ácido, lignina, amido, gordura e proteína bruta. Essas determinações foram realizadas, também, em amostras de pastagens de P. maximum de outras propriedades onde não estavam ocorrendo cólicas e das pastagens de Cynodon dactylon de onde provinham os equinos. Os resultados mostraram que os surtos de cólica ocorrem na época de chuva, quando as pastagens estão rebrotando com uma morbidade de 31,6%, e letalidade de 86,1%. As análises bromatológicas mostraram uma diferença significativa nas concentrações de amido (P=0,0072) do P. maximum que causou cólica (8,3 % e 9,2%), quando comparado com o P. maximum das outras propriedades (0,9% e 4,3%) e com o Tifton, utilizado previamente na alimentação dos mesmos equinos (0,2% e 0,8%). Em outra fazenda a doença foi reproduzida experimentalmente em um equino, no mês de março administrando P. maximum cortado contendo 6,5% de amido. A mesma pastagem não causou cólica quando foi administrada a equinos entre os meses de novembro a fevereiro, com 2,7% a 5,1% de amido. Estes resultados sugerem que a causa das cólicas em equídeos em pastagens de P. maximum, na época de rebrote, é o alto conteúdo de amido das mesmas.(AU)

Acute intestinal bloat occurs in horses and mules introduced into sprouting Panicum maximum cv. Tanzania, cv. Massai and cv. Mombaça pastures in northern Brazil during the rainy season. It has been suggested that the disease is due to high concentrations of non-structural carbohydrates in this grass. The paper aimed to study outbreaks of colics in the state of Rondônia, Brazil and contribute to the knowledge of the carbohydrates contained in P. maximum as the cause of the disease. For this, ten farms which had cases of intestinal bloat were visited. On two farms, horses were introduced into such a toxic pasture. Samples of pasture were collected for determination of digestible energy, lysine, dry matter, water soluble carbohydrates, ether soluble carbohydrates, non-fiber carbohydrates, neutral detergent fiber, acid detergent fiber, lignin, starch, and fat. Samples of P. maximum pastures from neighboring farms, where the disease was not occurring, and from Cynodon dactylon pastures where the horses had been grazing before were also collected. The results showed that colics occur in the rainy season in sprouting pasture with a morbidity of 31.6%, and lethality of 86.1%. The pastures which induce colic showed significantly (P=0.0072) higher starch concentration (8,3 and 9,2%) than pastures of P. maximum which did not cause colic (0,9 and 4,3%) as well as the Cynodon dactylon pastures ingested previously by the horses (0.2 and 0.8%. On another farm, the disease was produced experimentally in a horse receiving in the feeder P. maximum collected from a toxic pasture with 6.5% of starch. The same pasture did not cause colic from November to February with starch content of 2.7 to 5.1%. It is suggested that the cause of colic in equids ingesting sprouting pasture of P. maximum is the high starch content of this pasture during the groth period.(AU)

Repellent Action of Carapa guianensis and Caesalpinia ferrea for flies species of Calliphoridae family / Ação repelente de Carapa guianensis e Caesalpinia férrea paraespécies de mosacas da família Callip horidae

ABSTRACT: Myiases occur by the infestation of fly larvae in tissues of live vertebrate animals, resulting in economic loss. Phytotherapy is considered an important alternative in the control of insects, which may reduce the economic impacts. Carapa guianensis is a plant that has been studied as a repellent against mosquitoes and Caesalpinia ferrea is reported in tropical climates, and there are few studies about its repellent action. The present study was designed to evaluate the repellent action of s C. guianensis and C. ferrea plants on flies species of the Calliphoridae family. W.O.T. traps containing deteriorated bovine liver and herbs cream of at concentrations of 20 and 50% were used to catch the flies. It was reported that the creams containing C. ferrea at concentrations of 20 and 50% and C. guianensis at the concentration of 50% have repellent effect against species of Calliphoridae family.

RESUMO: Miíases ocorrem pela infestação de larvas de moscas em tecidos de animais vertebrados vivos, resultando em perdas econômicas. Fitoterapia é considerada uma alternativa importante no controle de insetos, o que pode reduzir os impactos econômicos. Carapa guianensis é uma planta que tem sido estudada como um repelente contra mosquitos e Caesalpinia ferrea Mart. é encontrada em climas tropicais, e há poucos estudos sobre sua ação repelente. O presente estudo foi desenhado para avaliar a ação repelente das plantas C. guianensis e C. ferrea Mart. em espécies de moscas da família Calliphoridae. Armadilhas WOT contendo fígado bovino deteriorado e creme de ervas em concentrações de 20 e 50% foram usadas para capturar as moscas. Verificou-se que os cremes contendo C. ferrea Mart. em concentrações de 20 e 50%, e C. guianensis, na concentração de 50%, têm efeito repelente contra as espécies da família Calliphoridae.

Poisoning by Amorimia (Mascagnia) sepium in sheep in northern Brazil.

The aim of this study was to determine the cause of sudden deaths in sheep in the Anari Valley of the state of Rondônia, in northern Brazil. In one outbreak, sheep were placed in an area where the owner had cut Amorimia (Mascagnia) sepium and let it dry for two days. Fourteen out of 35 sheep died with few outward clinical signs observed over a period of about 10 h after the ingestion of the dry plant. Dry A. sepium was administered experimentally to 9 sheep. Five died after the ingestion of single doses of 3-6.6 g/kg body weight (bw). Two sheep died after the ingestion of total doses of 6.4-31 g/kg bw over the course of 4 and 5 days, respectively, and one died after being treated with 33 daily doses of 0.56 g/kg bw. Six sheep died during exercise, and three died without exercise. Clinical signs were anorexia, muscular tremors, dyspnea, jugular engorgement, tachycardia, apathy, opisthotonos, foam in the nose, and recumbency. One sheep, which ingested a single dose of 1 g/kg bw, was not affected. The main macroscopic lesion was pulmonary edema. Histologic examination of the heart revealed degeneration and necrosis of cardiomyocytes, as well as multifocal inflammatory infiltrate of mononuclear cells. Fibrosis, neovascularization and infiltration by mononuclear inflammatory cells were observed in the sheep that ingested the plant for 33 days. Vacuolar-hydropic degeneration was observed in the epithelial cells of renal tubules of four sheep. It is concluded that A. sepium is responsible for sudden deaths in sheep.

Estudo histológico, imuno-histoquímico e ultra-estrutural das lesões induzidas experimentalmente por Ramaria flavo-brunnescens (Clavariaceae) em bovinos / Microscopic, immunohistochemical, and ultra-structural study of the lesions experimentaly induced by Ramaria flavo-brunnescens (Clavariaceae) in cattle

O objetivo deste trabalho foi estudar a patogenia das lesões observadas em bovinos intoxicados experimentalmente por Ramaria flavo-brunnescens. O cogumelo foi administrado imediatamente após a coleta a três bovinos da raça Jersey com 9-10 meses de idade. A dose diária administrada foi cerca de 20g/kg de peso vivo durante 7 (Bovino 1) e 13 dias (Bovinos 2 e 3), perfazendo doses totais de 140, 268 e 261g/kg de peso vivo a cada bovino, respectivamente. Um bovino (Bovino 4) da mesma raça e idade foi utilizado como controle. Os sinais clínicos observados nos bovinos intoxicados, caracterizaram-se por apatia, anorexia, hiperemia da mucosa oral, alisamento da superfície dorsal da língua e queda dos pêlos longos da cauda quando levemente tracionados. Os bovinos foram submetidos à eutanásia e necropsiados no 8° (Bovino 1) e no 16° dia (Bovinos 2-4) após o início do experimento. Histologicamente observou-se o epitélio da superfície dorsal da língua estreito com ausência das papilas filiformes, vacuolização dos queratinócitos e desprendimento da camada queratinizada. Na região laminar dos cascos observou-se vacuolização das lâminas epidérmicas, hiperplasia dos queratinócitos e queratinização irregular e flocular. Na pele da extremidade da cauda havia hiperqueratose ortoqueratótica, vacuolização da bainha radicular externa, espessamento da queratina triquilêmica e infiltrado inflamatório mononuclear ao redor dos folículos. No estudo imunohistoquímico, utilizando os anticorpos anti-pancitoqueratina e anti-Ki67 (para marcação da proliferação celular) não foram observadas diferenças entre o epitélio da superfície dorsal da língua dos bovinos intoxicados e o do bovino controle. No estudo por microscopia eletrônica, observou-se diminuição dos tonofilamentos e espaços intercelulares acentuadamente dilatados na camada espinhosa do epitélio da língua. Os resultados obtidos neste trabalho favorecem a hipótese de ação do princípio tóxico de Ramaria flavo-brunnescens...

The objective of this study was to investigate the pathogenesis of the lesions observed in cattle experimentally poisoned by Ramaria flavo-brunnescens. The mushroom was given to three 9 to10-month-old Jersey calves immediately after harvesting. Daily doses were around 20g/kg of body weight during 7 (Calf 1) or 13 days (Calves 2-3), and the total doses of mushroom given were 140, 268, and 261g/kg of body weight, respectively. One calf (Calf 4) with same age and breed was used as control. Clinical signs were characterized by prostration, anorexia, hyperemia of oral mucosa, and loosening of long hairs of the tail tip under mild traction. The calves were submitted to euthanasia and necropsied on days 8 (Calf 1) and 15 (Calves 2-4) after the beginning of the experiment. Microscopically, there was smoothness of dorsal epithelium of tongue with absence of filiform papillae, vacuolation of keratinocytes, and loosening of the keratin layer. In the hooves, there was vacuolation and irregular keratinization of the laminar epidermis and hyperplasia of keratinocytes. Hyperkeratosis, vacuolation of the external root sheath, thickening of tricholemal keratin, and inflammatory infiltration around hair follicles were observed on the skin of the tail tip. Immunohistochemical results with anti-pancytoceratin and anti-Ki67 (cell proliferation marker) antibodies showed no differences between the tongue dorsal epithelium of the control and experimental calves. Ultrastructural study demonstrated decrease in tonofilaments and increased intercellular spaces of the spinous layer of the tongue dorsal epithelium. The results of this study favor the hypothesis of an interference with the epithelial keratinization mechanisms by the toxic principles of Ramaria flavo-brunnescens.

Estudo histológico, imuno-histoquímico e ultra-estrutural das lesões induzidas experimentalmente por Ramaria flavo-brunnescens (Clavariaceae) em bovinos / Microscopic, immunohistochemical, and ultra-structural study of the lesions experimentaly induced by Ramaria flavo-brunnescens (Clavariaceae) in cattle

O objetivo deste trabalho foi estudar a patogenia das lesões observadas em bovinos intoxicados experimentalmente por Ramaria flavo-brunnescens. O cogumelo foi administrado imediatamente após a coleta a três bovinos da raça Jersey com 9-10 meses de idade. A dose diária administrada foi cerca de 20g/kg de peso vivo durante 7 (Bovino 1) e 13 dias (Bovinos 2 e 3), perfazendo doses totais de 140, 268 e 261g/kg de peso vivo a cada bovino, respectivamente. Um bovino (Bovino 4) da mesma raça e idade foi utilizado como controle. Os sinais clínicos observados nos bovinos intoxicados, caracterizaram-se por apatia, anorexia, hiperemia da mucosa oral, alisamento da superfície dorsal da língua e queda dos pêlos longos da cauda quando levemente tracionados. Os bovinos foram submetidos à eutanásia e necropsiados no 8º (Bovino 1) e no 16º dia (Bovinos 2-4) após o início do experimento. Histologicamente observou-se o epitélio da superfície dorsal da língua estreito com ausência das papilas filiformes, vacuolização dos queratinócitos e desprendimento da camada queratinizada. Na região laminar dos cascos observou-se vacuolização das lâminas epidérmicas, hiperplasia dos queratinócitos e queratinização irregular e flocular. Na pele da extremidade da cauda havia hiperqueratose ortoqueratótica, vacuolização da bainha radicular externa, espessamento da queratina triquilêmica e infiltrado inflamatório mononuclear ao redor dos folículos. No estudo imunohistoquímico, utilizando os anticorpos anti-pancitoqueratina e anti-Ki67 (para marcação da proliferação celular) não foram observadas diferenças entre o epitélio da superfície dorsal da língua dos bovinos intoxicados e o do bovino controle. No estudo por microscopia eletrônica, observou-se diminuição dos tonofilamentos e espaços intercelulares acentuadamente dilatados na camada espinhosa do epitélio da língua. Os resultados obtidos neste trabalho favorecem a hipótese de ação do princípio tóxico de Ramaria flavo-brunnescens...

The objective of this study was to investigate the pathogenesis of the lesions observed in cattle experimentally poisoned by Ramaria flavo-brunnescens. The mushroom was given to three 9 to10-month-old Jersey calves immediately after harvesting. Daily doses were around 20g/kg of body weight during 7 (Calf 1) or 13 days (Calves 2-3), and the total doses of mushroom given were 140, 268, and 261g/kg of body weight, respectively. One calf (Calf 4) with same age and breed was used as control. Clinical signs were characterized by prostration, anorexia, hyperemia of oral mucosa, and loosening of long hairs of the tail tip under mild traction. The calves were submitted to euthanasia and necropsied on days 8 (Calf 1) and 15 (Calves 2-4) after the beginning of the experiment. Microscopically, there was smoothness of dorsal epithelium of tongue with absence of filiform papillae, vacuolation of keratinocytes, and loosening of the keratin layer. In the hooves, there was vacuolation and irregular keratinization of the laminar epidermis and hyperplasia of keratinocytes. Hyperkeratosis, vacuolation of the external root sheath, thickening of tricholemal keratin, and inflammatory infiltration around hair follicles were observed on the skin of the tail tip. Immunohistochemical results with anti-pancytoceratin and anti-Ki67 (cell proliferation marker) antibodies showed no differences between the tongue dorsal epithelium of the control and experimental calves. Ultrastructural study demonstrated decrease in tonofilaments and increased intercellular spaces of the spinous layer of the tongue dorsal epithelium. The results of this study favor the hypothesis of an interference with the epithelial keratinization mechanisms by the toxic principles of Ramaria flavo-brunnescens.

Susceptibilidade de animais de laboratório à intoxicaçäo por Ateleia glazioviana (Leg. Papilionoideae) / Susceptibility of laboratory animals to the intoxication by Ateleia glazioviana (Leg. Papilionoideae)

Coelhos, cobaias, ratos e camundongos foram utilizados com a finalidade de reproduzir a forma cardíaca da intoxicaçäo por Ateleia glazioviana. Quatro animais de cada espécie receberam por 4 meses a planta, secada à sombra, na concentraçäo de 10 por cento na raçäo, fornecida na forma de pelets. Os pelets foram preparados misturando 700 g de raçäo comercial, 200 g de amido de milho, 1000 ml de água destilada e 100 g de planta seca e, posteriormente, secados em estufa a 100ºC, durante 16 a 20 horas. Quatro animais de cada espécie serviram como testemunhas, recebendo a raçäo preparada da mesma forma, porém com a utilizaçäo de azevém (Lolium multiflorum) em lugar de A. glazioviana. Era fornecida água à vontade e, para os coelhos e cobaias, também aveia (Avena sativa) verde diariamente. Esses animais näo apresentaram nenhuma alteraçäo clínica, e foram pesados semanalmente nas últimas 5 semanas do período experimental, näo apresentando diferença significativa no ganho de peso. A necropsia näo foram observadas alteraçöes macroscópicas e pelo exame histológico também näo foram detectadas lesöes significativas no coraçäo e em outros órgäos. Para testar a atividade abortiva de A. glazioviana, raçäo contendo 10 por cento de planta seca, preparada da mesma forma que no experimento anterior, foi administrada a 11 outros ratos, fêmeas, prenhes, nos dois últimos terços da gestaçäo. Um grupo controle de 11 fêmeas recebeu a raçäo com azevém a 10 por cento, durante o mesmo período. Esses animais tiveram filhotes normais e no prazo correto. Para determinar a possível perda de toxidez da planta durante a preparaçäo dos pelets, A. glazioviana foi aquecida por 16 a 20 horas a 100ºC e, posteriormente, administrada a um ovino em 26 doses diárias de 2,65 g/kg de planta seca. Durante o período experimental, a ovelha apresentou batimentos cardíacos mais fortes, taquicardia e arritmia cardíacas, depois bradicardia e, no período final, apatia acentuada. Foi sacrificada 7 dias após a última administraçäo da planta. Esse animal apresentava gestaçäo de 2,5 a 3 meses e o feto näo apresentava sinais de autólise. As alteraçöes macroscópicas mais evidentes à necropsia foram ascite, hidrotórax, áreas esbranquiçadas no músculo cardíaco e fígado de coloraçäo clara. Na histologia do coraçäo foram observadas degeneraçäo e necrose de fibras cardíacas e proliferaçäo de tecido conjuntivo fibroso. O fígado apresentava congestäo e degeneraçäo de hepatócitos nas áreas centrolo-bulares