RESUMO

Due to the scarcity of information on Breton horses, the objective was to study hematobiochemical values of this breed. Blood samples were collected from 29 Bretons, males and females, of different ages, in Brasília-DF, distributed into groups, according to age, without distinction of sex (G1): animals from 4 to 9 years old (n=16) and (G2): from 10 to 26 years old (n=13). The horses were also distributed into males and females for comparisons between the sexes. Values for red blood cells, hemoglobin, creatinine, and urea were statistically higher in females. Fibrinogen was higher in males. Lymphocyte values were higher in G1, but mean corpuscular volume, monocytes, neutrophils, and GGT in G2 were higher than G1. The hematocrit value differed between the ages of the females and was higher than that of the males, while the older male animals showed higher values than the young animals. Females presented lower platelet values than males, with older females having higher platelet values than younger females, in the same way as males. G1 females had the highest leukocyte values. The leukocyte values in males of G2 were higher than those of G1. This same behavior occurred for lymphocytes, eosinophils, and creatine kinase. Considering the albumin and aspartate aminotransferase variables, females had the highest values in the group of animals aged 4 to 9 years. Bretons are considered cold-blooded animals, which is consistent with the observed blood count values. However, it is concluded that these horses have biochemical values similar to warm-blooded breeds.

Devido à escassez de informações sobre equinos da raça Bretão, objetivou-se estudar valores hematobioquímicos da raça. Foram coletadas amostras de sangue de 29 Bretões, machos e fêmeas de diferentes idades, em Brasília-DF, distribuídos entre grupos, segundo idade, sem distinção de sexo (G1): animais de 4 a 9 anos (n=16) e (G2): de 10 a 26 anos (n=13). Os mesmos também foram distribuídos em machos e fêmeas para comparação entre os sexos. Valores para hemácia, hemoglobina, creatinina e ureia foram estatisticamente maiores nas fêmeas. Fibrinogênio foi maior nos machos. Valores de linfócitos do G1 foram maiores, mas o volume corpuscular médio, monócitos, neutrófilos e GGT do G1 foram menores que do G2. Valor do hematócrito difere entre idades das fêmeas e foi superior ao dos machos, os animais machos mais velhos apresentaram valores superiores aos jovens. As fêmeas apresentaram valores de plaquetas menores que os machos, sendo que as mais velhas apresentaram valores de plaqueta maiores que as mais jovens, da mesma forma que os machos. No G1, as fêmeas apresentaram os maiores valores de leucócitos. Os valores de leucócitos nos machos do G2 foram maiores que os do G1. Esse mesmo comportamento ocorreu para linfócitos, eosinófilos e creatinaquinase. Já para as variáveis albumina e aspartato aminotransferase, no grupo de animais de 4 a 9 anos, as fêmeas tiveram os maiores valores. Bretões são animais de sangue frio, o que condiz com os valores do hemograma observados. Porém, conclui-se que estes equinos apresentam valores bioquímicos similares aos de sangue quente.

RESUMO

The present study aimed to investigate the effects of a combination of progesterone with different doses of E-17ß on following end points: (1) ovarian follicular dynamics and emergence of a new follicular wave, and (2) superovulatory response and embryo yield. In Experiment 1, 28 ewes were randomly divided into four groups (n = 7) to receive either 2.0 mg, 1.0 mg, 0.5 mg or none E-17ß one day after insertion of a progesterone device. The different doses of estradiol similarly delayed the moment of follicular emergence (overall mean = 3.1 ± 1.0 days vs. control group = 0.86 ± 1.0 days; P < 0.01), but the emergence of the new wave showed greater synchronization with the 0.5 mg dosage of E-17ß. In Experiment 2, sixty-two donor ewes received an internal progesterone release device (day -1) for 7 d and 1 d after the insertion of this device (day 0) were allocated randomly to receive 0.5 mg of E-17ß or only the vehicle (control group). Superstimulation was initiated on day 3 with the administration of 133 mg of pFSH in eight decreasing doses. Contrary to expectations, the protocol with the administration of 0.5 mg E-17ß did not improve the percentage of donors with > 2 CL, the number of CL and the production of embryos (P > 0.05). It was concluded that the combination of progesterone and 0.5 mg E-17ß was more efficient in synchronizing the emergence of the new follicular wave, however this approach seems to be unnecessary in ewe's superovulation programs.