Oestrus synchronization and conception rate in Kedah-Kelantan cattle following treatment with CIDR-B and cloprostenol (Penyelarasan estrus dan kadar kebuntingan lembu Kedah-Kelantan selepas rawatan dengan CIDR-B dan kloprostenol)

The effectiveness of CIDR-B treatment for 12 days compared with the double injections of cloprostenol for oestrus synchronization in Kedah-Kelantan (KK) cows was evaluated. A total of 148 KK cows were used in three trials conducted at MARDI Research Station, Kluang, Johor. Cows were allocated randomly into two groups. Group 1 was given two injections IM of cloprostenol at 12 days apart; group 2 inserted with CIDR-B devices for 12 days. The cows in both groups were detected for oestrus behaviour and were artificially inseminated (AI) 12 h later. Pregnancy rate was diagnosed by plasma progesterone assay and *MARDI Research Station, Kluang, P. O. Box 525, 86009 Kluang, Johor, Malaysia **Livestock Research Centre, MARDI Headquarters, P. O. Box 12301, 50774 Kuala Lumpur, Malaysia Authors’ full names: Johari Jiken Abdullah, Daud Endam, Mohd. Khusahry Mohd. Yusof and Mohamad Aziz Dollah ©Malaysian Agricultural Research and Development Institute 1998 J. Trop. Agric. and Fd. Sc. 25(2) (1997): 231–237