author(s)
AR Ratnaparkhi, SG Deshmukh, CH Pawshe, VB Kale, SD Chepte, SB Harkal, SY Ramteke and AD Jadhao

abstract
The objective of present research work is to study the efficacy of two different synchronization protocols for improving the fertility in postpartum crossbred cows. A total of 20 healthy crossbred cows at 60-90 days postpartum were selected from Dr. PDKV, Akola dairy farm and used in this study. Cows were examined for health disorders and palpated per rectum for ovarian activity before synchronization. Pre synchronization medicinal treatment was given to the cows before synchronization. Cows in group-I (n=10) received Ovsynch protocol and cows from group II (n=10) were received two injections of PGF2α (500 µg Cloprostenol) 11 days apart and fixed time A.I. was done at 24 to 48 hrs post second PGF2α administration in both the groups. Estrus detection and intensity of oestrus was done by visual observation and per rectal examination. The percent estrus response observed in present study showed no significant difference between both the groups. The mean time interval for onset of induced estrus show non-significant difference in Ovsynch and double PGF2α protocols. The mean duration of estrus showed no significant difference between the synchronized groups. The percent intense type of intensity was numerically higher in Double PG protocol as compared to Ovsynch protocol. From the present findings it was observed that the number of animal pregnant at first service was numerically higher in Ovsynch as compared to double PGF2α. The Ovsynch protocol induces better estrus response and first service conception rate in post partum cows.