THE EFFECT OF PLACENTA EXPULSION TIME AND POSTPARTUM INTERVAL TO FIRST ESTRUS ON DAYS OPEN OF ONGOLE CROSS COWS

Tati Rohayati, Tita Damayanti Lestari, EndangYuni Setyowati, Dedi Rahmat

Abstract
   The research was conducted in Breeding Centre and Artificial Insemination Development (BCAID) of Beef Cattlein Ciamison 30 first partum of Ongole Cross Cows (OCC) that had previously been artificially inseminated. The research was aimed to obtain a reproductive recommendation of the effect of placenta expulsion time and postpartum interval to first estrus on the days open formulation. The parameters observed were the placenta expulsion time, postpartum interval to first estrus, and days open. Data were analyzed by path analysis. The results indicated that placenta expulsion time and postpartum interval to first estrus, simultaneously, had no significant effect on the days open. However, partially, postpartum interval to first estrus had a significant effect (P<0.05) on the days open with the effect of 13.675 percent.

Key words: placenta, estrus, days open, Ongole Cross, Cow