Genetic parameters for jumping performance in Brazilian Sport Horses

This study aimed to estimate genetic parameters for jumping measures in the Brazilian Sport Horses breed, looking to see which jump characteristics can be evaluated early and that present favorable genetic correlations (ϒg) with measures of later sports performance. Data were available for the results of jumping competitions on the Brazilian Sport Horses. Two traits were calculated: Classification (CLASS) of the animal (taking into consideration obstacle height, number of competitors, type of competition (regional, national, international) and final score (SCOREF) taking into consideration the weight of the competition, height of the obstacles and score for the placement and type of event. Heritabilities were low for the full database (0.00 and 0.07 for CLASS and SCOREF, respectively), but higher when only young horses were considered (0.09 and 0.67, respectively). Genetic correlations between these traits and subjective functional traits (using a scale of 0 to 10) measured at stallion approval for reproduction showed that Power was favorable for indirect selection for both traits (-0.85 for CLASS and 1.00 for SCOREF). Jump also showed a favorable correlation for SCOREF (0.53) but unfavorable for CLASS (1.00). Considering the importance of Temperament and the absence of unfavorable genetic correlations between it and competition results it was concluded that this trait can be maintained among the selection objectives of Brazilian Sport Horses. Suggestions are made for further genetic studies with this breed, and possible modifications in the evaluation regulations to improve data quality. Keywords: competition; final score; genetic correlations; heritability; temperamen

Comparação entre a fotometria e a contagem em câmara hemocitométrica para a determinação da concentração espermática do sêmen equino

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Redução da gestação gemelar em éguas puro sangue de corrida antes ou após a fixação uterina da vesícula embrionária

A gestação gemelar é um sério problema devido às perdas econômicas geradas pelos altos índices de abortos, natimortos, mortalidade perinatal e queda de fertilidade da égua. Diversos métodos têm sido utilizados para realizar a redução de um dos gêmeos, como o esmagamento precoce de uma das vesículas sob controle ultra-sonográfico. O experimento teve como objetivo verificar a eficácia da redução de uma das vesículas embrionárias no 16 o dia pós-ovulação, antes ou depois de sua fixação no útero. Foram analisados os registros de 1337 éguas, da raça Puro Sangue de Corrida (PSC), pertencentes a três criatórios da região Sul do Brasil, num período de 10 anos. O diagnóstico de gestação foi realizado através de ultra-sonografia a partir do 10o dia após a ovulação e repetido semanalmente até os 45 dias de gestação. Uma vez diagnosticadas gestações gemelares procedeu-se a eliminação de uma das vesículas embrionárias pelos seguintes métodos: (a) diagnóstico antes da fixação no 16o dia pós-ovulação - esmagamento de uma das vesículas, (b) diagnóstico após o 16o dia com vesículas não justapostas - esmagamento de uma das vesículas ou (c) diagnóstico após o 16o dia com vesículas justapostas - restrição alimentar de concentrado durante duas semanas. A técnica foi bem sucedida quando ocorreu a redução de apenas uma das vesículas embrionárias. Naquelas gestações em que as vesículas se encontravam justapostas após os 30 dias optou-se pela administração de prostaglandina. A taxa geral de prenhez observada foi de 68,3% (914/1337) e a porcentagem de gestação gemelar foi de 11,5% (105/914). Diagnosticaram-se 38 gestações gemelares após a fixação, no 16o e 62 o dia antes da fixação. Houve cinco perdas de dados. A redução embrionária realizada antes da fixação foi significativamente (p=0,0317) mais bem sucedida do que quando o procedimento ocorreu após a fixação embrionária. Conclui-se, que o esmagamento de uma das vesículas é um procedimento eficaz na redução da gestação gemelar, principalmente quando realizado antes do 15o dia de gestação

Raiva em equino no município de Porto Alegre - RS, Brasil

Background:  :  :  : rabies is a fatal zoonosis caused by a highly neurotropic RNA virus which causes neurological signs and that is distributed almost worldwide. Rabies affects domestic and wild animals and this is a disease transmitted by their bites, through which the virus present in the saliva is inoculated. In Brazil, Desmodus rotundus is the main hematophagous bat species that transmits rabies, especially to herbivores e equines. In equines, the clinical manifestation varies a lot, including both the paralytic and the furious form of the disease. The goal of this study is to describe a case of equine rabies in the city of Porto Alegre, Rio Grande do Sul, Brazil. Case: a six-year old male American Quarter Horse, which presented a clinical picture characterized by colic, depraved appetite and difficulty to move, was admitted to the Hospital de Clínicas Veterinárias of Universidade Federal do Rio Grande do Sul (HCV-UFRGS). The horse did not respond to treatment, therefore, it was submitted to exploratory laparotomy, when the moderate intestinal constipation and low intestinal motility was observed. A large colon enterotomy was performed and the intestinal contents were partially emptied. During recovery from anesthesia, the animal remained in lateral decubitus, not making any attempt to stand up. The animal did not show a favorable clinical evolution a few hours later, displaying weakness particularly in the hind limbs. Consequently, the animal underwent euthanasia. Samples of body organs were collected and fixed in formol 10%, processed routinely for histological purposes and then stained by hematoxylin and eosin. The histopathological examination revealed nonsuppurative meningoencephalitis in the central nervous system, without the presence of Negri bodies. Due to the history of recent rabies cases in neighbor areas of the property from where the animal came, direct immunofluorescence (IFD) and immunohistochemical (IHQ) exams for rabies were requested. The result was negative in IFD and a positive immunolabeling was observed in IHQ, thus demonstrating a viral antigen labeling in neurons of the cervical spine, pons, mesencephalon and cerebellum. Discussion: intracytoplasmic inclusions, also known as Negri bodies, are important and pathognomonic findings that were not observed in this case. Its presence and concentration depend on the stage and course of the disease, and they are not present in up to 30% of rabies cases, because certain virus strains do not produce Negri bodies. In equines, the occurrence of Negri bodies is less frequent than in bovines. IFD is the most adequate rabies diagnosis method, which is a highly sensitive technique (80-100%). The result was negative for this case, being confirmed only by IHQ. The immunohistochemical test is an important laboratorial diagnosis tool of rabies, because it allows the solution of unspecific meningoencephalitis cases when Negri bodies are not present. The treatment of animals with rabies is not considered. Vaccination in endemic regions or in areas where a rabies case has occurred is necessary. Rabies cases near the property where the animal lived were reported, but a prophylactic vaccination was not carried out. Rio Grande do Sul had a peculiar epidemiological status regarding rabies, as urban rabies cases had not been reported for approximately 17 years. However, rabies transmitted by hematophagous bats is still endemic in rural areas. This case demonstrates the importance of maintaining a rabies vaccination schedule in equine properties

Variações na bioquímica sangüínea de cavalos de salto submetidos a exercício de baixa intensidade em esteira

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El Telegrama del Rif: El Telegrama del Rif - Año XXXI Número 11477 - 1932 diciembre 11 (11/12/1932)

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Comparação entre a fotometria e a hemocitometria para a determinação da concentração espermática do sêmen equino

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Comparação entre a fotometria e a hemocitometria para a determinação da concentração espermática do sêmen equino

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Comparação entre a fotometria e a contagem em câmara hemocitométrica para a determinação da concentração espermática do sêmen equino

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