The repeat breeder syndrome is a multi factorial problem which affects the fertility, prolongs the age at 1st calving in heifers and extends the inter-calving periods in cows. Forty eight repeat breeder crossbred cows were selected on the day of estrus and randomly assigned to four equal Groups of twelve each namely Ovsynch (Group I), Cosynch (Group II), Heatsynch (Group III) and control (Group IV) groups to study the efficacy of various ovulation synchronization programs in repeat breeding crossbred cows. The mean serum cholesterol concentrations were increased significantly (P<0.05) at estrus after treatment among all groups when compared to control. The first, second and overall service conception rates in Ovsynch, Cosynch, Heatsynch and control groups were 50.00, 33.33, 66.67; 33.33, 25.00, 50.00; 66.67, 25.00, 75.00 and 8.33, 18.18, 25.00%, respectively.
Repeat breeder cow, Synchronization of estrus, Cholesterol
