Background: Wry nose is a congenital deformity that causes respiratory obstruction and decreased oxygenation rate. Gestation in a wry nose mare may be considered a risk to the neonate since it depends on the maternal environment for development. Compromised oxygenation during pregnancy can lead to fetal distress and cause consequences on fetal development. However, depending on the degree of the impairment, the fetus may still be able to adapt. The aim of the present study was to report the gestation in a mare with facial deviation until term and to assess blood gases in the mare and neonate, and to evaluate the histomorphometry of the placenta. Case: A Criollo breed mare presenting facial deviation (Wry Nose) was donated to Equine Medicine Research Group (ClinEq) of the Federal University of Pelotas (UFPel) due to the presence of the physical deformity. When the mare was five years old, it was inseminated and had a pregnancy confirmed. At the fifth month of gestation, evaluation of fetal aorta diameter, fetal orbital diameter and combined thickness of the uterus and placenta (CTUP) started to be performed monthly to assess gestation health. The assessment of the fetal orbit and aorta diameter revealed a linear increase of both variables with the progress of gestation indicating a normal fetal development. CTUP remained in the normal reference range, presenting no alterations during the gestational length. The mare foaled at 324 days of gestation a coat showing no congenital deformities. The foaling was monitored until the complete passage of fetal membranes. A complete clinical and hematological evaluation of the foal was carried out after birth. The foal showed normal adaptive behavior, clinical and hematological parameters during the first hours of life, although presenting physical signs of immaturity. Venous blood samples were collected from the mare at 315 days of gestation, immediately after foaling and 24 h post-partum for lactate and blood gas analysis. Mild changes were observed in the mare's blood gas analysis at foaling that were compensated within 24 h post-partum. Venous blood samples were collected from the umbilical cord and from the foal after birth, at 12 and 24 h post-partum to measure blood gases and lactate. The newborn foal presented respiratory acidosis immediately after birth, which was metabolically compensated at 24 h post-partum. Both mare's and foal's lactate evaluation were within the normal reference ranges. After expulsion of the placenta, samples from the gravid horn, uterine body and non-gravid horn were collected for histological and histomorphometric evaluation. In the histological evaluation, avillous areas were detected in the gravid horn and uterine body and mild hypoplasia was found in the uterine body. Placental histomorphometry revealed larger total microcotiledonary and capillary areas on the non-gravid horn when compared to the remaining areas of the placenta (gravid horn and uterine body). No abnormalities on the placental vasculature were detected. Discussion: To date,...
Este estudo teve como objetivo determinar a soroprevalência de leptospirose em cavalos de corrida hospedados no Jockey Club de Pelotas (JCP) e avaliar os fatores de risco relacionados a essa doença. Foram incluídos 84 equinos da Raça Puro Sangue Inglês. Os animais foram submetidos à avaliação clínica geral e a colheita de sangue para obtenção de amostras de soro. Para detecção de anticorpos anti-leptospiras foi realizado o teste de soroaglutinação microscópica (MAT) para os seguintes sorovares de L. interrogans: Australis, Autumnalis, Batavie, Bratislava, Copenhageni, Grippothyphosa, Hardjoprajitno, Icterohaemorrhagiae, Pomona, Pyrogenes e Patoc, sendo considerado reagente quando a aglutinação foi ≥ 1:100. Posteriormente, um único entrevistador aplicou um questionário epidemiológico aos responsáveis pelos equinos para determinar a presença de fatores de risco para leptospirose no local. Dentre os 84 equinos, apenas nove (10,7%) apresentaram titulação para L. interrogans. As titulações variaram entre 1:100 e 1:400, sendo que três equinos apresentaram titulação para mais de um sorovar. Os sorovares identificados neste estudo foram Canicola (33,3%), Grippotyphose (33,3%), Icterohaemorrhagiae (22,2%), Australis (22,2%), Pyrogenes (11,1%), Bratislava (11,1%), Copenhageni (11,1%), Autumnalis (11,1%) e Hardjoprajitno (11,1%). Não houve associação entre os resultados do teste sorológico e os dados obtidos através do questionário epidemiológico (p > 0,05). Através deste estudo verificou-se que a soroprevalência para L. interrogans em equinos do JCP é baixa. Estudos epidemiológicos em outros hipódromos são necessários para determinar fatores de risco que estejam associados à infecção por L. interrogans em cavalos de corrida.
The aim of this study was to estimate the genetic parameters for the morphometric measurements of withers height (WH), thoracic circumference (TC) and cannon bone circumference (CBC) of Criollo horses, stratified for maternal and paternal effects. Statistical genetic design of factor crossings was used to evaluate the offspring of full siblings and half‐siblings. Fifty stallions were selected (n = 50) who had been crossed with six mares each (n = 6), to provide 300 parental pairings in which two offspring were born per mare (n = 600). WH in females and TC in males were highly influenced by additive genetic effects, while the other morphometric measures were found to be closely related to the general effects of the environment. WH had the greatest additive genetic influence on female offspring (47.06%), while TC presented the greatest additive genetic influence on male offspring (58.73%). When comparing the parental influence on the morphometric characteristics evaluated, TC and CBC had greater additive genetic influence from maternal effects, regardless of offspring sex. However, the WH in female offspring showed greater maternal additive genetic contribution, while in males this characteristic presented greater paternal additive genetic influence. For WH in male offspring, narrow sense heritability (hr2: 0.26) was more influenced by paternal effects, while for WH in females (hr2: 0.47), TC in females (hr2: 0.08) and males (hr2: 0.59), and CBC in females (hr2: 0.07) and males (hr2: 0.05) the maternal effects were the most important. Therefore, the phenotypic expression of WH in males and females and TC in males is influenced by the additive genetic effect of the genes. On the other hand, the TC in female progenies and CBC in progenies of both sexes are closely related to the effects of the environment. The results obtained in this study could be useful in the selection process of Criollo horses.
Background: Breeding of Crioulo horses in the southern region of Brazil is very significant. Notwithstanding, not all animals meet the standards defined for the breed, raising concern among breeders, owners and veterinarians, driving them to an effort to know and understand the development of Crioulo foals. In order to get a registry at Brazilian Association of Crioulo Horse Breeders (ABCCC), the foals must be presented to a certified technician as of 24 months of age and show the breed standards and measurements required. To date, there are no data concerning development of this breed available. Therefore, this study aims to describe the growth curve of Crioulo foals in the south region of Rio Grande do Sul.Materials, Methods & Results: The study was conducted in three Crioulo horse breeding farms in the cities of Santa Vitória do Palmar, Bagé and Aceguá, in the state of Rio Grande do Sul, Brazil, for a period of two years (2013-2015). We followed up on 267 Crioulo foals from birth up to 24 months of age. Biometric evaluation was divided in 26 periods, with 40 animals in each and random repetition of individuals. Period one: birth to seven days; period two: seven to 21 days; monthly from 1st to 24th month. The three breeding farms presented similar environmental conditions and the horses were submitted to similar management. Measurements were taken on a monthly basis, using a mechanical scale for weight and a hippometer for height. The analysis were conducted on SAS/ETS® version 9.2. Logistic non-linear regression model was used to obtain growth curves for height and minimum, medium and maximum weight of the foals on their respective ages, by this way six growth curves were produced. Results show an increase in weight and height at 24 months of age compared to the moment of birth. This increase was accentuated during the first months of life, both in weight and height. Thus, it is possible to observe that the first six months of life is characterized by a larger growth rate and is therefore, essential for the foals development, requiring special attention from the breeder and owner.Discussion: The growth curve obtained show that not all individuals reach the measurements required by the breed’s association, corroborating the empirical observation of breeders and technicians in their routine. This is also a concern related to other Brazilian breeds such as Mangalarga Marchador, Pantaneira, Campeira. For the mentioned breeds, the adequate growth curve has already been described aiming to controlling foal development. The ABCCC require that foals as of 24 months of age have the minimum values of 1.40 m 1.38 m and 1.38 m; and maximum values of 1.50 m, 1.48 m and 1.50 m, for males, females and geldings, respectively, in order to receive the Association brand and the permanent registry. According to the growth curve, the first two months of the foal’s life show the largest growth rate, reaching 78.4% of an adult’s height with average growth of 20 cm, reaching 1.05 m. Genetic features, nutritional and sanitary conditions, directly influence this period. Overweight associated to exercising increases the risk of musculoskeletal injury and represent a factor for stress on the joints. This should be a concern among Crioulo breeders and the knowledge of their growth curve is important for an objective assessment seeking for a gradual and weighted development. In this work, it was possible to determine the growth curve of Crioulo breed foals in the south region of Rio Grande do Sul, from birth up to 24 months of age, providing minimum, medium and maximum parameters referring to withers height and body weight.
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