The effect of equine chorionic gonadotrophin (ecg) injection combined with prostaglandin F2α (pGF2α) and gonadotrophin releasing hormone (GnRH) treatment on reproductive performance of Zandi ewes during non-breeding season

Document Type : Original Articles


1 Department of Animal Science, Faculty of Veterinary, Islamic Azad University, Ghaemshahr Branch, Ghaemshahr, Iran

2 Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

3 Department of Animal Science, Faculty of Agriculture, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran

4 Animal Science Research Institute, Karaj, Iran


In this study, we aimed to investigate reproductive performance in estrus-induced Zandi ewes treated with equine chorionic gonadotrophin (eCG) injection in combination with prostaglandin F2α (PGF2α)and gonadotrophin releasing hormone (GnRH) during non-breeding season. The estrous cycle was synchronized using controlled internal drug release (CIDR) for 12 days. The ewes were randomly assigned to five groups (n=100 in each group). The first group (control) did not receive hormone injection, the second group (eCG) received 400 IU of eCG at the time of CIDR removal, the third group (eCG+PGF2α) received 400 IU of eCG and 1 ml of PGF2α at the time of CIDR removal, the fourth group (eCG+GnRH) received 400 IU of eCG at the time of CIDR removal and 1 ml of GnRH injection on the day of insemination, and the fifth group (eCG+PGF2α+GnRH) received 400 IU of eCG, 1 ml of PGF2α at the time of CIDR removal, and 1 ml of GnRH on the day of insemination. The results showed that the heat response rate was higher in all the groups receiving hormonal injections compared with the control group (P<0.05). In addition, the lambing and parturition rateswere significantly (P<0.05) higher in the groups receiving GnRH compared with other treatments.In fact, in groups receiving eCG and PGF2α, lambing and parturition rateswere higher than the control group (P>0.05). In conclusion, use of eCG at the time of CIDR removal and GnRH on the day of insemination increased reproductive performance. Therefore, it can be applied as a strategy for increasing lambing rate in ewes.


Main Subjects

Article Title [French]

L’effet de l’injection de gonadotrophine chorionique équine combinée à un traitement de libération de prostaglandine F2α et gonadotrophine sur les performances reproductives des brebis Zandien dehors de la saison de reproduction

Abstract [French]

L’objectif de cette étude était d’étudier les performances reproductives chez les brebis Zandien dehors de la saison de reproduction après un œstrus induit par le biais d’une injection de gonadotrophine chorionique équine (eCG) combinée à un traitement de libération de prostaglandine F2α(PGF2α)et gonadotrophine (GnRH). Le cycle de l’œstrus a été synchronisé par la libération interne contrôlée de médicament (controlledinternaldrug release, CIDR). Les brebis ont été réparties au hasard dans 5 groupes (n=100 dans chaque groupe). Le premier groupe (témoin) n’a reçu aucun traitement, le second (eCG) a été traité avec 400 IU d’eCG lors de la suppression de la CIDR, le troisième (eCG+PGF2α) a reçu 400 IU d’eCG et 1 ml de PGF2α lors de la suppression de la CIDR, le quatrième (eCG+GnRH) a été traité avec 400 IU d’eCG lors de la suppression de la CIDR et une injection d’1 ml de GnRH le jour de l’insémination. Les résultats montrent que le taux de réponse à la chaleur était plus fort dans tous les groupes ayant reçudes injections hormonales comparés au groupe témoin (P<0,05). De plus, les taux d’agnelage et de natalité étaient sensiblement plus élevés (P<0,05) chez les groupes traités avec de la GnRH comparés aux autres traitements. Cependant, les groupes ayant reçu de l’eCG et de la PGF2α montraient des taux d’agnelage et de natalité plus importants comparés au groupe témoin(P>0,05). En conclusion, l’utilisation de l’eCG lors de la suppression de la CIDR et de GnRH le jour de l’insémination améliore les performances reproductives. Par conséquent, ces traitements peuvent être utilisés comme une stratégie afin d’augmenter l’agnelage chez les brebis.

Keywords [French]

  • Taux d’agnelage
  • eCG
  • GnRH
  • PGF2α
  • Brebis Zandi
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