Fertility of bos indicus and B. indicus X B. Taurus crossbred cows and heifers after oestrus synchronization in the rift valley of Ethiopia
1998
Amsalu Sisay (Ethiopian Agricultural Research Organization, Addis Abeba (Ethiopia))Abule Ebro (Ethiopian Agricultural Research Organization, Addis Abeba (Ethiopia))Azage Tegegne (International Livestock Research Institute, Addis Abeba (Ethiopia))
This study examined estrus response, estrus response interval and pregnancy rate of Bos indicus and B. Indicus x B. taurus crossbred cows and heifers after oestrus synchronization. A total of 101 non-pregnant and cycling animals, composed of 63 Boran (46 heifers and 17 cows) and 38 Boran-Simmental crossbreds (23 heifers and 15 cows) were treated with 2 ml of PGF subscript 2 was 38.1% for cows and 71.1% for heifers. Crossbred heifers (78.3%) and cows (46.7%) responded better than Boran heifers (65.2% and cows (29.4%), respectively. The mean estrus response interval was shorter in heifers (58.3 hr) than cows (75.0 hr). However, the overall pregnancy rate was basically similar, 54.3% in cows and 59.8% in heifers. The overall result achieved in the study was acceptable and the procedure used could be adopted to produce uniformly pregnant animals to farmers to allow systematic on-farm performance evaluation.
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