Comparing estradiol-based protocols for synchronization of ovulation in fresh Holstein cows

Document Type : Full Research Paper

Authors

1 Department of Animal Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 , ,. Department of Animal Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

3 Department of Animal Sciences, Gorgan Agricultural Sciences and Natural Resources University, Gorgan, Iran.

Abstract

The objectives of this study were to compare fertility between heatsynch and estradoublesynch protocols in fresh Holstein dairy cows. Holstein cows with normal ovary and uterus (n= 191, yielding more than 30 kg of milk/d and parity 3.2±1.1) were randomly assigned into two experimental groups, including 1- heatsynch (n=96) , GnRH-7d-PGF2α-24h-EB-48H-TAI or 2) estradoublesynch (n=86), PGF2α-2d-GnRH-7d-PGF2α-24h-EB-48h- TAI. Results showed that estradoublesynch increased the percentage of cows diagnosed pregnant cows at 32 and 60 d after AI (P < 0.05). Conception rate was greater in estradoublesynch compared to heatsynch protocol at d 60 after TAI. Pregnancy loss was lower in estradoublesynch compared to heatsynch protocol (P < 0.05; 8.81 vs. 19.23 % for heatsynch and estradoublesynch protocols, respectively). Mean (± SEM) diameter (mm) of ovulatory follicle at the time of TAI was larger in heatsynch (19.2±0.32) than estradoublesynch (17.1±0.19). In conclusion, estradoublesynch resulted in younger ovulatory follicle compared to heatsynch and causes higher conception rate as well as lower pregnancy loss in this group. 

Keywords

References

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Veterinary Research & Biological Products
Volume 29, Issue 4
December 2016
Pages 38-44

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History

  • Receive Date: 26 October 2015
  • Revise Date: 06 September 2016
  • Accept Date: 23 January 2016

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