ABSTRACT
Resumen El estrés por frío en los terneros puede ser muy perjudicial para su salud y rendimiento futuro. El objetivo del presente trabajo fue evaluar el efecto de las condiciones de manejo de la crianza artificial y su relación con estrés por frío en terneros de tambo. Se evaluaron 160 terneros durante las primeras horas de la mañana, y se registró si los animales poseían capa o no y si disponían o no de cama. Se observó si contaban con reparo para limitantes climáticas. También se registró la temperatura rectal y si temblaban o no. Se consideró que terneros con temperatura rectal igual o inferior a 37,2 °C se encontraban en estrés por frio. El análisis estadístico de los datos se hizo mediante la prueba no paramétrica de Chi cuadrado y se calculó la probabilidad de ocurrencia mediante Odds Ratio. Encontrándose que los terneros en condiciones de estrés presentaron 4,93 veces mayor probabilidad de temblar; que disponer de cama fue favorable para prevenir el estrés (0,027), que las capas plásticas incrementaron la probabilidad de sufrir de estrés (0,006) y que proveer reparo a los animales tiene un efecto positivo en la prevención del estrés por frío (p = 0,027) en los terneros de tambo.
Abstract Cold stress in calves can be very detrimental to their health and performance. The aim of this work was to evaluate the effect of artificial rearing management conditions and their relationship to cold stress in dairy calves. A total of 160 calves were evaluated during the early morning hours and it was recorded whether or not the animals had cape and whether or not they had bed in pens. Also, it was observed if they had protection for climatic limitations. Rectal temperature and whether or not they were shivering were also recorded. Calves with rectal temperature equal to or lower than 37.2 °C were considered to be in cold stress. The statistical analysis of the data was performed using the non-parametric Chi-square test and the probability of occurrence was calculated using Odds Ratio. It was found that calves under stress conditions were 4.93 times more likely to shiver; that having bed in pens was favorable for preventing stress (0.027), that plastic cape increased the probability of suffering from stress (0.006) and that providing shelter to animals had a positive effect on the prevention of cold stress (p = 0.027) in dairy calves.
ABSTRACT
Resumen El Valle de Lerma (VDL) es una región ubicada en la parte central de la provincia de Salta, República Argentina, la cual da origen a la mayor parte de la producción láctea provincial. La nematodiasis gastrointestinal es uno de los problemas sanitarios de mayor impacto económico en los sistemas productivos de base pastoril. El objetivo de este trabajo fue caracterizar la variación estacional de la eliminación de huevos y géneros de nematodos al medio ambiente. Mensualmente se tomaron muestras de materia fecal en bovinos de recría para conteo de huevos por gramo (HPG) y coprocultivo para determinación de géneros en tres establecimientos ganaderos de la región. En todos ellos se observaron dos picos en los valores medios de HPG, que ocurrieron entre principios de verano y fines de otoño. Los géneros/especies más prevalentes fueron Cooperia pectinata, Haemonchus spp. y Cooperia punctata, seguidos por Oesophagostomum spp., Trichostrongylus spp. y Ostertagia spp. Estos resultados aportan nueva evidencia al conocimiento de la epidemiología de los nematodos gastrointestinales de los bovinos en la región del VDL.
Abstract The Lerma Valley (LV) is a region located in the central part of the province of Salta, Argentine Republic. The largest dairy production in the province originates in this region. Gastrointestinal nematodiasis is one of the health problems with the greatest economic impact in pastoral-based production systems. The objective of the present work was to characterize the seasonal variation of the elimination of eggs and genera of nematodes to the environment. Fecal matter samples were taken from rearing cattle to count eggs per gram (Epg) and culture for gender determination monthly in three farms in the region. In these, it was possible to observe that the Epg values showed two peaks, which occurred between the beginning of summer and the end of autumn. Regarding the genera/species, the most prevalent were Cooperia pectinata, Haemonchus sp. and Cooperia punctata, followed by Oesophagostomum spp., Trichostrongylus spp. and Ostertagia spp. These results contribute with new evidence to the knowledge of the epidemiology of gastrointestinal nematodes of cattle in the LV region.
ABSTRACT
A cross-sectional survey of 19 dairy sheep farms in Argentina was carried out with the purpose to know farm management, health practices, and occurrence and mortality of diseases. The survey comprised 40 percent of all sheep milking farms in Argentina. A questionnaire was conducted by way of personal interviews with sheep owners during farm visits. The proportions of farms reporting routine vaccination for clostridial diseases, contagious ecthyma, pneumonia and mineral and vitamin parenteral administration were 63 percent, 47.3 percent, 16.6 percent and 42.1 percent respectively. Regular treatment against lice was used in 37.5 percent of the farms, and 89.5 percent o the farmers treated against gastrointestinal nematodes (GIN). The mean number of GIN drenches per farm was 2.26±1.78 annually. In 68.4 percent of the milking flocks the California Mastitis Test was regularly done and 55.6 percent of the farmer managers had sampled their flocks once a year for Brucella ovis antibodies. During the pre-mating period respectively 68.4 percent and 50 percent of farmers clinically examined their rams and ewe for general health and teeth condition. The udders of ewes were frequently inspected at the start of each milking period. The most important parasite problems noticed were GIN (reported by 57.9 percent of farmers), lice (57.9 percent) and scabies (10.5 percent) and the most frequent infectious diseases were ecthyma (73.7 percent), pneumonia and other respiratory problems (57.9 percent), clinical mastitis (55.6 percent), clostridial diseases (36.9 percent) and foot lameness (35.2 percent). Photosensitivity (47.4 percent) and ruminal acidosis (42.1 percent) were reported as other frequent toxic or metabolic disorders. Owners mentioned that the mean lifespan or milk productive time per ewe was 4.5±1.4 years. Perinatal lamb mortality was 8.5 percent and the total flock mortality rates, above the first 24 h of life was 6.9 percent. ...
Foi realizado um levantamento longitudinal em 19 fazendas de ovinos leiteiros na Argentina com o objetivo de conhecer práticas de manejo, medidas sanitárias e ocorrência e freqüência das enfermidades. O levantamento incluiu 40 por cento de todas as fazendas do país que produzem leite ovino. Um questionário foi utilizado com entrevistas pessoais com os ovinocultores durante visita às fazendas. A percentagem de fazendas que relataram vacinação rotineira contra clostridioses, ectima contagioso, pneumonia e administração parenteral de minerais e vitaminas foi 63 por cento, 47,3 por cento, 16,6 por cento e 42,1 por cento, respectivamente. Parte dos produtores (37,5 por cento) realizava tratamento regularmente contra piolhos e 89,5 por cento contra nematódeos gastrintestinais. O número médio de tratamentos anti-helmínticos anuais, por fazenda, era de 2,26+1,78. Em 68,4 por cento dos rebanhos leiteiros o Califórnia Mastite Teste (CMT) era regularmente realizado e 55,6 por cento dos produtores colhiam amostras de seus rebanhos uma vez por ano para diagnóstico de Brucella ovis. Durante o período de pré-acasalamento 68,4 por cento e 50 por cento dos produtores examinavam clinicamente seus carneiros e a condição geral e de dentes de suas ovelhas. O úbere das ovelhas era geralmente inspecionado no início da ordenha. Os principais problemas parasitários eram nematódeos gastrintestinais (mencionado por 57,9 por cento dos produtores), piolhos (57,9 por cento) e sarna (10,5 por cento) e as doenças infecciosas mais frequentes foram ectima contagioso (73,7 por cento), pneumonia e outros problemas respiratórios (57,9 por cento), mastite clínica (55,6 por cento), clostridioses (36,9 por cento) e laminite (35,2 por cento). Fotossensibilização (47,4 por cento) e acidose ruminal (42,1 por cento) foram relatadas como as principais desordens tóxicas ou metabólicas. Na visão dos produtores, a expectativa de vida produtiva ou o tempo de produção de leite por ovelha ...