Vol. 10, Issue 1, Part B (2025)

Author(s): D Gopikrishnan, M Selvaraju, M Palanisamy, A Raja and K Ramya

Abstract: The present experiment was conducted to evaluate the efficacy of synchronization protocol using CIDR and PGF₂α on the conception rate of repeat breeding cross bred cows. A total of 10 normal cyclical cross bred cows and 10 repeat breeding cross bred cows with suprabasal preovulatory progesterone concentration and negative for subclinical endometritis were selected for the study. The experimental cows were subjected to estrus synchronization protocol using CIDR and PGF₂α. CIDR was inserted intravaginally for 8 days and PGF₂α was administered on day 7 after CIDR insertion and CIDR was removed on day 8. The cows were inseminated 48 hours and 72 hours after CIDR removal. The pregnancy was diagnosed on day 45 post insemination. The conception rate was 60 per cent (6/10) in normal cyclical cows and 30 per cent (3/10) in repeat breeding crossbred cows in the present study. The present study concluded that synchronization of estrus using CIDR and PGF₂α improved the conception rate in repeat breeding cows but the not on par with normal cyclical repeat breeding cows.

DOI: 10.22271/veterinary.2025.v10.i1b.2004