The Comparison of Two Different Seasons Oestrus Synchronization Results with Fixed-Time AI Protocols

Karakok S. G. , GÜNGÖR C. , Saler M., Ulubilir M.

JOURNAL OF ANIMAL AND VETERINARY ADVANCES, vol.8, no.2, pp.373-378, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.2007/2007.1362.1366
  • Page Numbers: pp.373-378



The aim of this study, was to compare two different oestrus synchronization methods with fixed-time Artificial Insemination (AI) protocols for Holstein Friesian cow during winter and summer seasons in the Mediterranean region. For this purpose, oestrus was induced using prostaglandins in 110 Holstein Friesian cows kept on an intensive dairy farm. Oestrus was prolonged using progesterone and fixed-time AI applied. Cows were randomly allocated to two groups: The prostaglandin F2α (Lutealyse) group (n = 60), in which cows received 2 injections of prostaglandin 11 days apart; the progesterone group (n = 50), in which cows received an implant at the base of the ear. When the treatments were applied to animals during the summer months the conception rate decreased from 64.81-54.16%. The efficiency of oestrus synchronization with treatments was satisfactory in the winter season, but in the summer months both treatments will require improvements to achieve better results.