Comparative analyses of coproscopical techniques to diagnose enteroparasites in a group of captive Indian peafowl (Pavo cristatus).

Captive animals commonly have infections by direct life cycle parasites, since they are easily transmitted between individuals. However, diagnosing these infections in the laboratory is challenging due to the wide variety of parasite, their life stages and to the variety of available diagnose techniques, being difficult to choose the best one. The present study sampled a group of captive Indian peafowl (Pavo cristatus) from São Paulo Zoological Park Foundation, São Paulo, Brazil, to test and compare different coproscopical techniques commonly applied in veterinarian clinical analysis laboratories: direct smear, concentrations by sodium chlorite, sucrose, zinc sulphate, faecal sedimentation and formalin-ether followed by modified Ziehl-Neelsen staining. Sensitivity, specificity, predictive values (positive and negative) and Cohen's kappa index were calculated. In total 108 samples were processed and parasites found were: nonsporulated coccidian oocysts (91.7%), Capillarinae eggs (89.8%), unidentified nematode larvae (75%), Ascarididae eggs (63%), unidentified nematode adults (60.2%), unidentified nematode eggs (42.6%), strongylid-like eggs (42.6%), Cryptosporidium spp. (28.7%), flagellated (15.7%) and ciliated (10.2%) protozoans, trematode eggs (0.9%), Acanthocephala eggs (0.9%), Adeleidae oocysts (0.9%) and Cruzia sp. eggs (0.9%). Sensitivity and specificity varied considerably between parasite groups. Cohen's Kappa index reinforces the recommendation of applying more than one technique to diagnose enteroparasites infections.

Seasonal effects on testes size and sustained semen quality in captive golden-headed lion tamarins, Leontopithecus chrysomelas.

The golden-headed lion tamarin (Leontopithecus chrysomelas) is an endangered primate that, according to timing of births, there seems to have seasonal reproductive patterns in captive populations inhabiting the Southern Hemisphere. The extent to which male tamarins have circannual cyclic fluctuations in testicular functions, however, remains unknown. Changes in testis size and seminal variables, therefore, were evaluated during the rainy and dry seasons of the year in seven males. There was estimation of mating and birth seasons from the breeding colony using a 27 year database (229 birth records). Births were distributed throughout the year with peaks occurring in August-October and January-March (39.7 % and 30.5 % of all births, respectively). Semen collection using penile vibrostimulation was successfully induced in more than 96 % of the attempts regardless of the season (total of 75 ejaculates). Body mass did not vary significantly between seasons, but relative testes size was larger during the dry season. Values for none of the seminal variables (total sperm count, total and progressive motility, plasma membrane and acrosome integrity, and total sperm defects), however, were different during the rainy and dry seasons. These results indicate that testicular function in golden-headed lion tamarins may not be affected by daylength changes, and that seasonal patterns of female reproduction is perhaps more relevant for the reproductive timing of the species. Furthermore, the possibility of year-round production of ejaculates containing viable sperm broadens our perspective of preserving genetic diversity within the species because there is a greater opportunity for semen collection and freezing.

Semen cryopreservation in golden-headed lion tamarin, Leontopithecus chrysomelas.

Wild animal genetic resource banking (GRB) represents a valuable tool in conservation breeding programs, particularly in cases involving endangered species such as the golden-headed lion tamarin (Leontopithecus chrysomelas). Thus, we aimed to assess a sperm freezing protocol for golden-headed lion tamarins using two different exenders: BotuBOV® (BB) and Test Yolk Buffer® (TYB). Ejaculates were collected by penile vibrostimulation from animals housed at São Paulo Zoological Park Foundation, São Paulo, Brazil, and after immediate analysis, two aliquots were diluted in BB and TYB. Postthawing samples were evaluated for total and progressive motility, plasma membrane and acrosome integrities, mitochondrial activity, susceptibility to oxidative stress, and sperm-egg-binding. No differences between BB and TYB were found for most seminal parameters, except for acrosome integrity and susceptibility to oxidative stress (in both cases BB showed higher values). However, in spite of these differences and regardless of the extender used, postthaw sperm motility and viability with the described protocol were encouraging (on average >50% and >80%, respectively), indicating that sperm cryopreservation may be a short-term measure for the conservation of golden-headed lion tamarins.

Assessment of different sperm functional tests in golden-headed lion tamarins (Leontopithecus chrysomelas).

The golden-headed lion tamarin (Leontopithecus chrysomelas) is an endangered species endemic to Brazil's Atlantic Forest, a shrinking biodiversity hotspot. As in other Neotropical primates, its semen characteristics and freezability are poorly studied. Hence, reproductive technologies for callitrichids would greatly benefit from reliable methods of semen analysis. In a bid to promote reproductive research in tamarins, we validated simple and inexpensive sperm function tests that can be used to monitor sperm-egg binding, plasma membrane and acrosome integrity, mitochondrial activity, and DNA fragmentation. Ejaculates from adult males were individually diluted and divided into control and damage-induced aliquots, and then samples comprising assorted amounts of damaged spermatozoa were examined by organelle-specific tests. Our findings showed that sperm-binding in chicken egg perivitelline membrane (EPM) positively correlated with the number of spermatozoa injured by snap-freezing. Eosin-nigrosin (EN) and propidium iodide readings were correlated with each other, and both provided robust measurements of plasma membrane integrity. A high correlation between expected and measured amounts of acrosome-intact spermatozoa was found using Fast Green-Rose Bengal (FG-RB), Coomassie Blue (CB), and FITC-PSA stains, and all three methods exhibited comparable results. Likewise, different percentages of UV-irradiated spermatozoa were accurately assessed for DNA integrity by Toluidine Blue (TB) and sperm chromatin dispersion (SCD) tests. Comparisons between 3,3'-diaminobenzidine (DAB) and JC-1 stains also indicated the reliability of the former assay to ascertain gradual increases in spermatozoa with greater mitochondrial function. These data confirmed that different parts of the tamarin spermatozoa can be simply and consistently evaluated by EPM, EN, FG-RB, CB, TB, and DAB protocols.

Giardia spp., ten years of parasitological data in the biggest zoo of Latin America

Giardia spp. (Diplomonadida: Hexamitidae) is an important and widely studied protozoan parasite with worldwide distribution. Nowadays have six described species, and the most important probably is Giardia duodenalis due to the zoonotical potential that some assemblages have. Many studies analysing samples from wild animals have detected Giardia in captive environment, including the zoonotic type. The aim of this study was to determine the prevalence of Giardia sp. in wild captive animals at São Paulo Zoo, using conventional parasitological techniques (direct smear, passive flotation with saturated sodium chloride solution and simple gravity sedimentation), from 2006 to 2016. In total, 7066 coprological exams were performed during this period with samples from mammals, birds, reptiles and amphibians. The prevalence of Giardia infections was of 1.5% (103/7066). Mammals had the higher prevalence of infections with 2% (77/3872), followed by birds with 1.1% (25/2186) and reptiles with only one positive sample (1/894). All samples from amphibians were negative. Representatives of thirteen families presented positive results for this parasite: Dromaidae, Phasianidae, Ramphastidae, Cervidae, Giraffidae, Canidae, Felidae, Herpestidae, Myrmecophagidae, Callithrichidae, Cebidae, Hylobatidae and Dipsadidae. This study presents the first report of Giardia sp. in Pavo muticus and Brachyteles arachnoides. Infections were prevalent in Cebidae and Ramphastidae species. The findings of this study highlight the importance of identifying which Giardia assemblage are involved in the infections and if they may have a zoonotic potential.

Testicular volume and semen characteristics in the endangered southern muriqui (Brachyteles arachnoides).

BACKGROUND: The southern muriqui (Brachyteles arachnoides) is an endangered Neotropical primate. Semen collection and description of its traits, as well as testicular morphometry, have never been reported for this species. METHODS: Testicles from five healthy adult captive southern muriqui were measured, and semen was collected by rectal probe electrostimulation (RPE). RESULTS AND CONCLUSIONS: A solid coagulum was identified in all ejaculates, and none of them liquefied, spontaneously or non-spontaneously. It was possible to collect semen using RPE, and although solids coagula did not liquefy, we managed to describe ejaculates characteristics and also confirmed that southern muriqui have relatively large testes size. Further investigations are needed to improve coagulum handling, to achieve a better spermatozoa recovery aiming its application in assisted reproductive technologies.

Ticks infesting captive and free-roaming wild animal species at the São Paulo Zoo, São Paulo, Brazil / Carrapatos infestando espécies de animais silvestres cativas e de vida livre no Zoológico de São Paulo, São Paulo, Brasil

Abstract Ticks are ectoparasites of worldwide distribution that affect vertebrates and can transmit pathogens to animals and humans. The Zoological Park Foundation of São Paulo (FPZSP) is located in a Conservation Unit in one of the most important remaining fragments of the Atlantic Rainforest biome in the suburbs of São Paulo, Brazil. The FPZSP houses more than 3,000 wild animals on exhibit, in breeding programs and in environmental education programs, and also attracts migratory birds and free-roaming wildlife. This study focused on identifying the diversity of tick species that infest captive and free-roaming animals at the FPZSP. The collection of ticks kept at the FPZSP contains 523 specimens that were collected from different host species between 1990 and 2017. Ten tick species were found. In addition, Amblyomma aureolatum (Pallas) was found on stray cats living in the Atlantic forest fragment in the FPZSP. This study reveals a low occurrence of parasitism in captive animals and a high diversity of tick species collected from hosts in this Atlantic forest fragment, contributing information about host-parasite relationships and potential vectors of zoonotic diseases, since the vectors of Brazilian spotted fever, A. aureolatum and Amblyomma sculptum Berlese, were found in some hosts.

Resumo Os carrapatos são ectoparasitas da classe Arachnida, conhecidos como importantes vetores de agentes infecciosos para animais e humanos. A Fundação Parque Zoológico de São Paulo (FPZSP) localizada em uma Unidade de Conservação do bioma Mata Atlântica e inserida na cidade de São Paulo, mantém mais de 3.000 animais selvagens cativos, abrigando ainda diversas espécies silvestres nativas da Mata Atlântica. Devido à importância do conhecimento dos carrapatos que parasitam a fauna selvagem, o objetivo deste trabalho foi identificar a coleção de carrapatos da FPZSP e analisar a diversidade desses parasitas em animais cativos e de vida livre. O acervo de carrapatos mantidos pela FPZSP contém 523 exemplares que foram coletados de diferentes espécies hospedeiras, desde 1990 até 2017. Dez espécies de carrapatos foram encontradas. Além dos animais silvestres, foram encontrados Amblyomma aureolatum (Pallas) em gatos domésticos errantes que circulam nas áreas da FPZSP. Este trabalho demonstra a baixa ocorrência de parasitismo em animais cativos e a alta diversidade de carrapatos nos hospedeiros deste fragmento de Mata Atlântica, contribuindo com informações sobre a relação parasita-hospedeiro e potenciais vetores de doenças zoonóticas, já que os vetores da Febre Maculosa Brasileira A. aureolatum e Amblyomma sculptum Berlese, foram encontrados em alguns hospedeiros.

Ticks infesting captive and free-roaming wild animal species at the São Paulo Zoo, São Paulo, Brazil.

Ticks are ectoparasites of worldwide distribution that affect vertebrates and can transmit pathogens to animals and humans. The Zoological Park Foundation of São Paulo (FPZSP) is located in a Conservation Unit in one of the most important remaining fragments of the Atlantic Rainforest biome in the suburbs of São Paulo, Brazil. The FPZSP houses more than 3,000 wild animals on exhibit, in breeding programs and in environmental education programs, and also attracts migratory birds and free-roaming wildlife. This study focused on identifying the diversity of tick species that infest captive and free-roaming animals at the FPZSP. The collection of ticks kept at the FPZSP contains 523 specimens that were collected from different host species between 1990 and 2017. Ten tick species were found. In addition, Amblyomma aureolatum (Pallas) was found on stray cats living in the Atlantic forest fragment in the FPZSP. This study reveals a low occurrence of parasitism in captive animals and a high diversity of tick species collected from hosts in this Atlantic forest fragment, contributing information about host-parasite relationships and potential vectors of zoonotic diseases, since the vectors of Brazilian spotted fever, A. aureolatum and Amblyomma sculptum Berlese, were found in some hosts.