Effect of artificial insemination methods on reproductive efficiency of Zandi ewes inseminated with fresh and frozen sperm

Document Type : Full Research Paper

Authors

1 Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

2 The Breeding Station of Zandi Sheep, Pishwa, Varamin, Iran.

3 Department of Poultry Science, Faculty of Agriculture, University of Tarbiat Modares. Tehran, Iran.

4 Department of Animal Science, Faculty of Agriculture Islamic Azad University, Ghaemshahr Branch, Ghaemshahr, Iran.

5 Animal Science Research Institute of Iran, Karaj, Iran.

Abstract

The aim of this study was to determine the effect of artificial insemination methods on reproduction efficiency of Zandi ewes inseminated with fresh and frozen semen. Two hundred and forty Zandi ewes (three- to four-years old, 55 kg weight) received CIDR for 12 days and at the time of CIDR removal, received 400 IU of eCG and were artificially inseminated 54 h after CIDR removal. Groups one to three included 120 ewes that were assigned into three equal groups and inseminated vaginally, by laparoscopy and transcervically, respectively with fresh semen. Groups four to six included 120 ewes that were assigned into four equal groups and inseminated vaginally, by laparoscopy and transcervically, respectively with frozen semen. The results showed that during using fresh semen, differences between artificial insemination methods were not significant, but during using frozen semen, the fertility rate was higher in laparoscopy method than other methods (P<0.05). After laparoscopy, transcervical artificial insemination had higher efficiency than vaginal insemination method (P<0.05). It can be concluded that using frozen semen, highest efficiency will be obtained if laparoscopy condition is available, otherwise, transcervical artificial insemination via oxytocin will be better than the vaginal method.

Keywords

References

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Veterinary Research & Biological Products
Volume 30, Issue 1
March 2017
Pages 127-131

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History

  • Receive Date: 20 February 2016
  • Revise Date: 09 April 2016
  • Accept Date: 09 April 2016

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