Comparative Studies on the Effect of Synchronization Protocols on Estrus Response, Ovulation Time and Conception Rate in Boer Goats during Early Breeding Season in Odisha

Background: Estrus synchronization is a reproductive technique which used in livestock species to enhance the reproductive performances. The present experiment was conducted to investigate the effect of CIDR (EAZI-BREED CIDR®) and Prostaglandin (PGF2α) on estrus response, ovulation time and conception rate during early breeding season of Boer goats. Methods: A total of 20 non-pregnant does (10 for CIDR based and 10 for double PGF2α based protocol) were used for the present experiment. For CIDR based protocol (Group I), does were inserted with EAZI-BREED CIDR intravaginally containing 0.3 mg progesterone and kept for 11 days. A single dose of 125 microgram PGF2α was injected before 24 hrs of EAZI-BREED CIDR removal and 4 µg Buserelin acetate on day of implant removal. For prostaglandin (PGF2α) protocol (Group II), does were injected intramuscularly with two doses of 125 µg cloprostenol at 11-day intervals. In both the groups teaser buck was used for estrus detection and mated by selected bucks. Result: Estrus response was hundred per cent in both the groups. The duration of onset of estrus (hours) was shorter (28.80±1.20) in CIDR treated protocol than double PGF2α protocol (40.20±1.30), where as the duration of estrus was longer in Group I (37.70±0.75) hour as compared to group II (33.60±0.54) does. Serum progesterone levels on day 0, on day 12 (24 hrs after completion of protocol) and day 35 after mating were1.31±0.13, 0.70±0.12 and 5.94±1.29 respectively for Group I, where as 1.13±0.13, 0.96±0.14 and 3.73±0.53 (ng/ml) were observed for Group II does. A significant difference was observed between day 12 and day 35 in both the groups but no significant difference was observed between the groups for day 0, 12 and 35. LH concentrations on the day of estrus did not vary significantly in both groups. Conception rates were 80 per cent and 60 per cent for group I and II respectively. In conclusion, the CIDR protocol provided better estrus synchronization and higher conception rates compared to the double PGF2α protocol, making it a more effective and reliable for estrus synchronization in Boer goats.