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THE OESTROUS CYCLE OF ZEBU AND SANGA BREEDS OF CATTLE IN CENTRAL AFRICA

Summary.: A total of 333 oestrous cycles was observed in fifty-five sexually mature cattle of Central African breeds. Silent ovulation accounted for 13% of the cycles. The normal cycle lengths averaged 21·89±1·64, 22·68±3·68 and 24·25±2·27 days for the Angoni, Barotse and Boran breeds, respectively. The lengths of the corresponding oestrous periods were 16·26±1·08, 17·43±1·18 and 14·79±3·03 hr. Ovulation occurred 31·50±1·45 hr from the time of onset of oestrus. Most animals came into heat around sunrise and sunset. Cervical changes were photographed.