Control of reproduction in the female Ndama cow by Norgestomet (CRESTAR)

: The purpose of this experiment was to test the efficiency of the Norgestomet CRESTARND on 91 Ndama cows living in three different ecological zones. The results of the experiments showed an average rate of heat synchronisation of 97.8%, an average heat time of 10.17 +/- 2.81 h with the intensity of these heat being essentially low or medium levels. The heats also occurred of mostly during the night. The time lag between the PGF2 alpha injection and the first signs of oestrus was 83.96 +/- 14.96 h and the one between removing the implant and the first heats was 34.78 +/- 14.9 h and the average blood's level of progesterone was 5 +/- 10.3 ng/ml. The efficiency of CRESTARND in the control of the sexual cycle of the Ndama cows was demonstrated by this study.