Abstract: Association between lambing performance (single lamb and twins) and reproductive hormones has been explored. Twenty four ewes divided into 4 groups of each 6 individuals were sampled according to the number of lambs in two breeds (Mongolian ewes and Poll Dorset ewes) blood samples from each individual ewe were collected at the three periods: estrus (day 0) estrus (day 11) and post-partum anoestrus. All the seven hormones concentration of the Poll Dorset ewes was higher than that of the Mongolian ewes in the three periods. And the hormones secretion shown different patterns in two breeds. Five hormones concentrations of ewes with twins were higher than that of ewes with single lamb, the reverse situation found in MT and T concentration even a few of them were statistically significant (p<0.05) at the three periods. Finally, the highly positive and negative significant correlations between hormones were detected, this relationship also shown the differences in two breeds.
Jing Wang, Liping Zhang, Jianping Wu, Jianlei Jia and Qiang Ding, 2013. Association Between Lambing Performance and Reproductive Hormones in Mongolian and Poll Dorset Ewes. Journal of Animal and Veterinary Advances, 12: 1089-1094.