Reproductive performance of Zel ewes with different dosage of eCG outside the natural breeding season

Document Type : Full Research Paper

Authors

1 Department of Clinical Sciences, Faculty of Veterinary Medicine, Semnan University, Semnan, Iran.

2 Department of Animal Sciences, Faculty of Veterinary Medicine, Semnan University, Semnan, Iran.

3 Department of Basic Science, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.

Abstract

Estrous synchronization is a valuable management tool that has been employed successfully in enhancing reproductive efficiency, particularly in cows, ewes and does (Kusina et al., 2000). Oestrous synchronization in small ruminants is achieved either by reducing the length of the luteal phase of the oestrous cycle with prostaglandin F2α or by artificially extending it with exogenous progesterone or potent progestagens A completely randomized design experiment was carried out using eighty Zel ewes during out of season breeding to compare different dosage of equine chorionic gonadotrophin (eCG) with controlled internal drug release (CIDR) dispensers to synchronize estrous. Intravaginal progestagen was administered for a 13-day period. Upon progestagen withdrawal, doses received 350, 400, 450 and 500 IU (eCG) intramuscularly. Teaser rams (1/8 ewes) were introduced 1 d after treatment removal to detect estrus. Ewes were subjected to fertile rams 40 h after CIDR removal. The results of this experiment showed that eCG was effective when used with CIDR. Different dosage of eCG treatments had not significant effect on estrus response (100% in all groups). Enhancing the level of eCG administration led to a increase in fecundity rate and lambing rate in this study. In conclusion the CIDR device with 450 and 500 IU can improve reproductive performance in Zel ewes comparable to 350 and 400 IU eCG.

Keywords

References

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History

  • Receive Date: 21 January 2014
  • Revise Date: 22 May 2014
  • Accept Date: 23 September 2014

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