Efficacy of two CoSynch protocols in Gudali zebu cows
DOI:
https://doi.org/10.19182/remvt.37020Keywords
Gudali zebu, induced ovulation, progesterone, oestrous cycle, artificial insemination, CameroonAbstract
The aim of the study was to test and compare the effectiveness of two classic heat induction protocols, CoSynch with or without progesterone, in Gudali zebus. It involved 39 animals. Three weeks post artificial insemination (AI), the cows were observed for cases of heat return. They were examined by uterine ultra-sound from day 44 after insemination. The induction rate (percentage of cows seen in heat in comparison with the number of cows treated) as well as retention rate of the progesterone-based intravaginal device were both 100%. Fertility rates at first AI were 10.5% and 35% following the standard CoSynch and CoSynch + progesterone protocols, respectively (p = 0.075). The cycled cows had a satisfactory fertility rate (80%) with the CoSynch + progesterone protocol unlike those not cycled (20%), and those treated with standard CoSynch. Therefore, in Gudali zebus the addition of progesterone increases the reproductive performance of a CoSynch protocol.
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© J.Kouamo et al., hosted by CIRAD 2022
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