Dirandeh, E., Ansari Pirsarae, Z., Deldar, H., Saberifar, T. (2016). Comparing estradiol-based protocols for synchronization of ovulation in fresh Holstein cows. , 29(4), 38-44. doi: 10.22034/vj.2016.106775
E. Dirandeh; Z. Ansari Pirsarae; H. Deldar; T. Saberifar. "Comparing estradiol-based protocols for synchronization of ovulation in fresh Holstein cows". , 29, 4, 2016, 38-44. doi: 10.22034/vj.2016.106775
Dirandeh, E., Ansari Pirsarae, Z., Deldar, H., Saberifar, T. (2016). 'Comparing estradiol-based protocols for synchronization of ovulation in fresh Holstein cows', , 29(4), pp. 38-44. doi: 10.22034/vj.2016.106775
Dirandeh, E., Ansari Pirsarae, Z., Deldar, H., Saberifar, T. Comparing estradiol-based protocols for synchronization of ovulation in fresh Holstein cows. , 2016; 29(4): 38-44. doi: 10.22034/vj.2016.106775

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

تحقیقات دامپزشکی و فرآورده‌های بیولوژیک
Article 6, Volume 29, Issue 4, December 2016, Pages 38-44    PDF (582.97 K)
Document Type: Full Research Paper
DOI: 10.22034/vj.2016.106775
Authors
E. Dirandeh* 1; Z. Ansari Pirsarae1; H. Deldar2; T. Saberifar3
1Department 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.
3Department 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
Estradoublesynch؛ Ultrasonography؛ fertility; Dairy cows؛ Heatsynch
References

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