Administration of GnRH treatment prior to ovsynch protocol to stimulate ovarian cycle in cows with functional anoestrus

Kacar C., Yildiz S., Pancarci S. M., Kaya M., Oral H., Gurbulak K., ...More

BULLETIN OF THE VETERINARY INSTITUTE IN PULAWY, vol.50, no.4, pp.497-501, 2006 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 4
  • Publication Date: 2006
  • Journal Name: BULLETIN OF THE VETERINARY INSTITUTE IN PULAWY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.497-501
  • Erciyes University Affiliated: No

Abstract

The study aimed to stimulate ovarian cycle and increase conception rates with administration of GnRH prior to the synchronisation of ovulation; by the use of Ovsynch protocol in cows (n=58) with anoestrus. For group I GnRH was administered one week prior to Ovsynch protocol. For group II, only Ovsynch protocol was applied. The synchronisation rate was statistically higher (P < 0.01) in group II (95.2%) than that in group I (71.0%). The conception rate was higher (P < 0.01) in group I (40.0%) than that in group II (20.8%). At the beginning of the Ovsynch protocol, the percentage of cows with progesterone levels higher than I ng/ml,vas 83.3% in group I, and 29.2% in group II, and cycling, rate, based on progesterone levels above 1 ng/ml, was higher in group I (50.0%) than that in group II (20.8%) among cows with body condition score (BCS) >= 2.5. In conclusion, additional GnRH treatment one,week prior to Ovsynch protocol, positively affected the conception rate and ovarian cycling, and this programme Could be used for the treatment of functional anoestrus in cows.