Oestrus response and fertility of suckled Kedah-Kelantan (KK) cows following oestrus synchronization using cloprostenol and a progesterone-releasing intravaginal device

J. A. Johari. M. O. A. riff  and N. Mohamad

Abstract

Oestrus synchronization using progesterone releasing intra-vaginal devices (PRID) in combination with cloprostenol were studied in three trials at MARDI Research Station. Keluang. Johore. A total of l25 heads of Kedah- Kelantan cows between 60 90 days post-partum were allotted randomly into two treatment groups: (1) Control (untreated) and (2) PRID + cloprostenol (PRID in place for 7 days + cloprostenol 24 h before PRID removal). Cows in the control group, detected in oestrus. were inseminated twice with frozen semen, at heat detection and l2 h later. Cows in the treated group were inseminated twice, at 4U h and 72 h following PRID removal. Pregnancy was diagnosed by rectal palpation at 60-90 days after insemination. Oestrus response within 5 days after PRID removal was 91.7%, of which 82% of the cows were observed in oestrus between day 2 and day 3. Pregnancy rate in the control group (43%) was significantly lower (p<0.0-5) than in the treated group (53.4%).This study demonstrates that PRID + cloprostenol treatment regime is very effective in inducing and synchronizing fertile oestrus in post-partum suckling cows.

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