Authors : A. Azizah, O.M. Ariff, H. Yaakub, J. Ahmad, S. Sukardi and H. Wahid
Abstract: The study was conducted to determine the differences in the interval between removal of Controlled Internal Drug Release (CIDR) and standing oestrus (C_ES) interval between CIDR removal and Ovulation (C_OV) interval between oestrus and Ovulation (ES_OV), predetermined Artificial Insemination (AI) and Pregnancy rate following prostaglandin (PGF) treatment and CIDR removal at standing oestrus in Kedah-Kelantan (KK) and KK crossbred cows. A total of 35 KK (n = 11), Brakmas (BK: n = 10) and Charoke (CK: n = 14) cows were inserted with CIDR containing 1.38 g Progesterone (P4) for 7 days and followed with intramuscular injection of 500 μg Cloprosterol of PGF synthetic analogue 2 days prior CIDR removal. The oestrous behaviour was observed for 72 h at 2 h intervals beginning 12 h after CIDR removal. AI was carried out at 6 and 12 h after standing oestrus was detected. Mean interval between C_ES, C_OV and ES_OV were 52.97±6.16, 94.42±16.41 and 53.75±25.36 h, respectively. The number of follicles >5 mm in diameter at the time of CIDR removal was significantly lower in CK (p = 0.04) compared to KK. The results of POF size and number of follicle size ≥5 mm either at CIDR removal or prior ovulation and P4 concentration at day 0, 7 and 14 were found to be not significantly different at p = 0.05. The pregnancy rate was higher (p<0.05) in CK (43.8%) followed by KK (31.3%) and BK (25%). The study provides results which could be used in the development of TAI on oestrous synchronisation protocol of KK and KK crossbred cows.
A. Azizah, O.M. Ariff, H. Yaakub, J. Ahmad, S. Sukardi and H. Wahid, 2012. Interval Between Oestrous Characteristics and Pregnancy Rate in Synchronised Kedah-Kelantan and Crossbred Cows. Journal of Animal and Veterinary Advances, 11: 3262-3267.