Study of sexual hormones alterations in native black goat does during winter and summer season

Abstract

Current study showed There are high significance increase (P<0.01) of the carcass weight in the winter compared with summer, whilst there is no significant difference between the number of ova in both seasons. There is a high significance effect increase in temperature and illumination period (P<0.01) during summer compared to winter, and also there is a high significance difference increase (P<0.01) in the animal age during winter compared to summer season. The study shows that there is a significant correlation (P<0.05) between temperature and the concentration progesterone, and a significant correlation between the carcass weight and the progesterone, also there is a high significance correlation (P<0.01) between carcass weight and the number of ova.