| Summary: | ABSTRACT:
Twenty nine ewes with similar weight and age were used to study the contributions of fetal number to circulating concentrations of progesterone or estradiol during whole pregnancy. The ewes were injected with 1 nil synthetic prostaglandin PGF2(x (PFOSCAviti, Inter...13) isia. and
were repeated on d l I from the first injection to synchronize the estrous cycle. Based on the number of lambs born at parturition date, the ewes were assigned into 5 groups (0. I, 2, 3, and 4) with n = 3, 12, 9, 4, and 1, respectively. Blood samples were collected every other week for progesterone and estradiol analyses using radioimiuunoassay. Simple correlation was used to determine the relationship between, the fetal number and serum progesterone or estradiol colicentratiolis. The results of the
experiment. showed that fetal number correlated with the maternal scrum progesterone concentrations either during the first half of pregnancy (P
|
|---|