Efficacité de deux méthodes de synchronisation des chaleurs à base de prostaglandine F2α chez le zébu  (<em>Bos indicus</em>) Goudali

Justin Kouamo; Toudjani Hassan  Abouame; Oumarou Lebale

doi:10.19182/remvt.36745

Authors

J. Kouamo, T.H. Abouame, O. Lebale

DOI:

https://doi.org/10.19182/remvt.36745

Keywords

zebu, crossbreds, induced ovulation, oestrus synchronisation, artificial insemination, Cameroon

Abstract

The objective of the study was to evaluate two prostaglandin F2α (alfaprostol 2 mg) based heat synchronization protocols, one short with a single injection and artificial insemination (AI) on observed heat, the other long with a double injection at 11 days› interval and AI at a fixed time 80 hours after the second injection. It involved 72 cows and 12 heifers of Gudali breed, all with menstrual cycles. The semen used was that of Brown Swiss, Aubrac and Gascon bulls. The heat induction rate was 100%, with a delay of 2 to 11 days post-injection for the onset of heat in the short protocol. After a minimum of 60 days post AI, a transrectal palpation was performed as well as monitoring of pregnancy until calving. Pregnancy, abortion, and calving rates were 17.8%, 13.3%, and 15.4, or for the short and long protocols 30.8%, 16.6%, 25.6%, and 6.7%, 0%, 6.6%, respectively (p < 0.05). The average duration of pregnancy was 290 ± 4.5 days, or for the short and long protocols 290 ± 4.5 days and 289.7 ± 5.8 days, respectively (p = 0.181). The average birth weight of the calves was 22.9 ± 1.4 kg, or for the short and long protocols 22.9 ± 1.6 kg and 23.0 ± 1.0 kg (p = 0.319), respectively. The sex ratio (% males to total population) was 69.2% (p = 0.6). Animals with a postpartum duration between 5 and 10 months, whose AI was performed in the uterus and between 16 and 17 hours after heat detection, showed higher fertility (p < 0.05).

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Affiliations

J. Kouamo
justinkouamo@yahoo.fr

Ecole des sciences et de médecine vétérinaire, Université de Ngaoundéré, BP 454, Ngaoundéré, Cameroun
T.H. Abouame Ecole des sciences et de médecine vétérinaire, Université de Ngaoundéré, BP 454, Ngaoundéré, Cameroun
O. Lebale Ecole des sciences et de médecine vétérinaire, Université de Ngaoundéré, BP 454, Ngaoundéré, Cameroun

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Efficacy of two prostaglandin- F2α-based heat synchronization methods in Gudali zebu (Bos indicus)

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