Oestrus synchronization and conception rate in Kedah-Kelantan cattle following treatment with CIDR-B and cloprostenol

J. A. Johari, E. Daud, M. Y. Mohd. Khusahry and M. A. Dollah

Abstract

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 by rectal palpation at day 60 after insemination. Oestrus response within 96 h post-treatment in the CIDR-B treated group was significantly higher (p<0.05) than in the cloprostenol-treated group. Only 32% and 52% of the KK cows treated with cloprostenol and CIDR-B respectively were detected for standing oestrus and were AI within 48 h post-treatment. The pregnancy rates of KK cows in cloprostenol and CIDR-B treated groups diagnosed per rectum were lower than the pregnancy rates diagnosed based on plasma progesterone profile. High early embryonic mortality was observed. The calving rate (44.3%) of KK cows treated with CIDR-B for 12 days was comparable with that of KK cows treated with the standard double injections of cloprostenol (42.2%). This study shows that CIDR-B treatment for 12 days is effective in inducing fertile oestrus and is comparable with the standard double injections of cloprostenol regime. However, it did not produce a tightly synchronized oestrus necessary for fixed predetermined inseminations.

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