PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Toscan G., Cadore G.C., Pereira R.C.F., Silva G.B., Cezar A.S., Sangioni L.A., Oliveira L.S.S. & Vogel F.S.F. 2010. [Equine neosporosis: occurrence of antibodies against Neospora spp. and association between the serological status of the mares and of their offspring.] Neosporose equina: ocorrência de anticorpos anti-Neospora spp. e associação entre o status sorológico de éguas e de suas crias. Pesquisa Veterinária Brasileira 30(8):641-645. Departamento de Medicina Veterinária Preventiva, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Av. Roraima 1000, Prédio 44, Camobi, Santa Maria, RS 97105-900, Brazil. E-mail: gugatoscan@hotmail.com Neospora caninum and N. hughesi are protozoa which can infect horses and can cause reproductive and neurological diseases, respectively. The pathogenesis of neosporosis in horses is poorly understood, as well as the sources of horizontal infection of N. hughesi. Furthermore, there are doubts about the role of the vertical transmission of Neospora spp. in maintenance of these parasites in equine populations. In this study, we evaluated: (1) the occurrence of infections by Neospora spp. in a population of mares (in reproductive age) on a farm of Crioula breed horses; and (2) the possible association between the serological status of mares and of their offspring, aiming to investigate, indirectly, the relevance of transplacental transmission for the occurrence of Neospora spp. in these horses. We found a highly significant association between the serological status of mares and their offspring. Although had been exposed to the same environmental risk factors, the descendants of seropositive mares had a higher percentage of seropositivity against Neospora spp. compared to the descendants of seronegative mares. The association between kinship and serological status indicates an influence of vertical (transplacental) infection raising the occurrence of Neospora spp. in the studied equine population.

• Neospora caninum N. hughesi

Abstract in Portuguese:

RESUMO.- Toscan G., Cadore G.C., Pereira R.C.F., Silva G.B., Cezar A.S., Sangioni L.A., Oliveira L.S.S. & Vogel F.S.F. 2010. [Equine neosporosis: occurrence of antibodies against Neospora spp. and association between the serological status of the mares and of their offspring.] Neosporose equina: ocorrência de anticorpos anti-Neospora spp. e associação entre o status sorológico de éguas e de suas crias. Pesquisa Veterinária Brasileira 30(8):641-645. Departamento de Medicina Veterinária Preventiva, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Av. Roraima 1000, Prédio 44, Camobi, Santa Maria, RS 97105-900, Brazil. E-mail: gugatoscan@hotmail.com Os protozoários Neospora caninum e N. hughesi infectam os equinos e podem provocar diferentes sinais clínicos associados a problemas reprodutivos ou a distúrbios neurológicos, respectivamente. A patogenia da neosporose é pouco conhecida nos equinos, bem como as fontes de infecção horizontal de N. hughesi. Além disso, há dúvidas quanto ao papel da transmissão vertical de Neospora spp. na sua manutenção em populações equinas. Neste estudo avaliaram-se: (1) a ocorrência da infecção por Neospora spp. na população de éguas em idade reprodutiva em um haras de cavalos da raça Crioula; e (2) a possível associação entre o status sorológico destas éguas com o de suas crias, como meio de investigar, indiretamente, a relevância da transmissão transplacentária na ocorrência da infecção por Neospora spp. nestes animais. A associação entre o status sorológico das éguas e o de suas crias foi altamente significativa. Os animais descendentes de éguas soropositivas tiveram maior ocorrência de anticorpos anti-Neospora spp. do que os descendentes de éguas soronegativas, embora expostos aos mesmos fatores de risco ambientais. A associação entre parentesco em primeiro grau e status sorológico indica a influência da infecção vertical (transplacentária) na ocorrência de Neospora spp. na população equina estudada.

Abstract in English:

ABSTRACT.- Eigenheer-Moreira J.F., Fernandes F.T., Queiroz F.J.R, Pinho T.G.& Ferreira A.M.R. 2007. [Comparative study of repeat breeds and healthy mares through endometrial histology and plasmatic progesterone concentrations.] Estudo comparativo de éguas repetidoras ou não de cio através da avaliação histológica do endométrio e das concentrações plasmáticas de progesterona. Pesquisa Veterinária Brasileira 27(12):506-512. Curso de Pós-Graduação em Clínica e Reprodução Animal, Rua Vital Brazil Filho 64, Niterói, RJ 24230-340, Brazil. E-mail: joana.vet@gmail.com.br The study aimed to compare endometrial histology and plasmatic progesterone (P4) concentration of repeat breeds and healthy mares. The hypothesis was that there is a correlation between infertility and endometrial histology and P4 concentration in both groups. A total of 36 Campolina and Mangalarga Marchador mares in reproductive age (3-23 years) were used, 11 of them were healthy mares (Control group, 7 embryo recipient and 4 embryo donors), and 25 repeat breeders (10 embryo recipient and 15 embryo donors), classified as based on their reproductive history. Endometrial and blood samples were collected for respectively histological and plasma progesterone concentration evaluation. The endometrial samples obtained after biopsy were fixed in Bouin’s fluid, processed, included in paraffin, and stained with Hematoxylin-Eosin (HE) for histopathological examination. Plasmatic progesterone concentrations were evaluated by enzyme immunoessay (ELISA). There was no correlation between progesterone concentration and fertility. But there was a positive correlation between age and fertility, as older mares had major tendency of subfertility than younger ones. There was also a correlation between biopsy categories and fertility, as more histological alterations were found, higher were the chances for the mares to be subfertile. However not all mares classified as Category I and II maintained pregnancy until parturition. Other factors could influence pregnancy maintenance. In the same way, not all mares in Category III were infertile. The endometrial biopsy was shown to be an easy and cheap diagnostic technique with minimal discomfort to the animals and, together with other data, to be a very important component in the investigation of mare fertility.

• Mare subfertility endometrial biopsy histopathology progesterone

Abstract in Portuguese:

ABSTRACT.- Eigenheer-Moreira J.F., Fernandes F.T., Queiroz F.J.R, Pinho T.G.& Ferreira A.M.R. 2007. [Comparative study of repeat breeds and healthy mares through endometrial histology and plasmatic progesterone concentrations.] Estudo comparativo de éguas repetidoras ou não de cio através da avaliação histológica do endométrio e das concentrações plasmáticas de progesterona. Pesquisa Veterinária Brasileira 27(12):506-512. Curso de Pós-Graduação em Clínica e Reprodução Animal, Rua Vital Brazil Filho 64, Niterói, RJ 24230-340, Brazil. E-mail: joana.vet@gmail.com.br The study aimed to compare endometrial histology and plasmatic progesterone (P4) concentration of repeat breeds and healthy mares. The hypothesis was that there is a correlation between infertility and endometrial histology and P4 concentration in both groups. A total of 36 Campolina and Mangalarga Marchador mares in reproductive age (3-23 years) were used, 11 of them were healthy mares (Control group, 7 embryo recipient and 4 embryo donors), and 25 repeat breeders (10 embryo recipient and 15 embryo donors), classified as based on their reproductive history. Endometrial and blood samples were collected for respectively histological and plasma progesterone concentration evaluation. The endometrial samples obtained after biopsy were fixed in Bouin’s fluid, processed, included in paraffin, and stained with Hematoxylin-Eosin (HE) for histopathological examination. Plasmatic progesterone concentrations were evaluated by enzyme immunoessay (ELISA). There was no correlation between progesterone concentration and fertility. But there was a positive correlation between age and fertility, as older mares had major tendency of subfertility than younger ones. There was also a correlation between biopsy categories and fertility, as more histological alterations were found, higher were the chances for the mares to be subfertile. However not all mares classified as Category I and II maintained pregnancy until parturition. Other factors could influence pregnancy maintenance. In the same way, not all mares in Category III were infertile. The endometrial biopsy was shown to be an easy and cheap diagnostic technique with minimal discomfort to the animals and, together with other data, to be a very important component in the investigation of mare fertility.

Abstract in English:

The ovaries of 1,374 mares collected at an abattoir were examined for gross evidence of ovulation such as hemorrhagic or luteal bodies. The exatninations were carried out from February 1984 to February 1985 in mares from the States of Rio Grande do Sul, Santa Catarina and Parana. The ovulatory rates observed for 1984 were 54.41% in February; 49.61% in March; 32,74% in April; 28.57% in May; 6.85% in June; 3.06% in July; 6.0% in August; 9.65% in September; 30.77% in October; 40.32% in November and 51.69% in December. In January and February of 1985 the ovulation rates observed were respectively 43.01 % and 43.48%. Of all ovulations 50.12% occurred in the right ovary and 49.88% in the left ovary. There was 6.97% of multiple ovulations.

• Mare oestrous cycle physiology

Abstract in Portuguese:

Os ovários de 1374 éguas de abate, procedentes dos Estados do Rio Grande do Sul, Santa Catarina e Paraná, foram examinados no período de fevereiro de 1984 a fevereiro de 1985, verificando-se a presença de corpos hemorrágicos ou corpos lúteos, expressada em ovulações. Foi observada uma taxa de 54,41% de ovulações no mês de fevereiro de 1984; 49,61% em março; 32,74% em abril; 28,57% em maio; 6,85% em junho; 3,06% em julho; 6,0% em agosto; 9,65% em setembro; 30,77% em outubro; 40,32%; em novembro; 51,69% em dezembro; 43,01% em janeiro de 1985 e 43,48% em fevereiro. Do total de ovulações, 50,12% ocorreram no ovário direito e 49,88% no ovário esquerdo. Observou-se, ainda, um total de 6,97% de ovulações múltiplas.

• Éguas ciclo estral fisiologia

Abstract in English:

One hundred and sixty eight mares were assessed by means of endometrial biopsies. The samples were collected from severa! S tud Farms in the S tates of Rio Grande do Sul and Paraná during the annual fall examination, from 1979 to 1984. According to the endometrial histopathological changes and their ability to carry a foal to term, the mares were grouped as follows: Group I, 124 (73.8%) mares with slight or absent endometrial changes; Group II, 32 (19.1 %) mares with moderate changes and Group III, 12 (7.1%) mares with severe changes. Every year, in the end of breeding season the number of mares which conceived and the number of concept losses were recorded. This was done until April 1985. The following results were obtained: Group I, 69.4% of conception rate and 4.6% of concept losses; Group II, 44.0% conception and 14.3% losses; Group III, 25.0% conception and 33.3% losses. Therefore a relationship was observed between the endometrial histopathological changes and the reproductive ability of the mares in this study. The endometrial biopsy is thus a valuable aid in estimating the fertility of mares.

• Mare fertility endometrial biopsy

Abstract in Portuguese:

Cento e sessenta e oito éguas Puro Sangue de Corrida (PSC) de diversos haras do Rio Grande do Sul e Paraná foram submetidas ao exame histopatológico de amostras endometriais retiradas por biopsia, durante os exames de outono realizados anualmente de 1979 a 1984; essas éguas foram agrupadas em três classes distintas, segundo as alterações histopatológicas do endométrio e a sua capacidade de levar uma gestação a termo. Foram observadas 124 éguas (73,8%) sem alterações ou com alterações discretas (Grupo I), 32 (19,1 %) com alterações moderadas (Grupo II) e 12 (7,1%) com alterações severas (Grupo III). Terminada a estação de monta de cada ano, foram acompanhadas as taxas de concepção e perdas durante a gestação até abril de 1985, obtendo-se um resultado de 69,4% de concepção e 4,6% de perdas durante a gestação para as éguas do Grupo I; 44% e 14,3% para as éguas do Grupo II; 25% e 33,3% para as éguas do Grupo III. Conclui-se que as alterações histopatológicas do endométrio guardam relação com a capacidade reprodutiva e que a biopsia endometrial é um valioso auxiliar na avaliação do prognóstico de fertilidade na égua.

• Égua fertilidade biopsia endometrial