[Estrus synchronization and insemination results in Arabian mares in the Eskisehir stud].

The study investigated the effectiveness of three different estrus synchronization methods on a group of Arabian mares aged 4 to 12. The study also examined the resulting first cycle conception rates.

Objective and Methodology

• This study aimed to determine the most effective method of inducing synchronized estrous cycles in Arabian mares.
• Thirty mares were divided into three groups, each subjected to a different synchronization method. These involved the use of hormones prostaglandin F2 alpha and human chorionic gonadotropin (hCG) applied at various times and in different manners.
• Ovulation in the mares was monitored through consistent rectal palpations, and insemination was conducted near the time of ovulation.

Results of the Study

• The response rate to synchronization varied between the groups. Groups B and C had higher response rates (80%) than Group A (60%). Oestrus signs generally began between 24 to 36 hours after the final dose of prostaglandin F2 alpha, with ovulation typically occurring 5 to 6.5 days later.
• Pregnancy rates following the first cycle of insemination also differed across the groups. Group C had the highest rate at 87%, followed by Group B at 75%, and Group A at 66.7%. These rates are based on the number of mares that responded to the synchronization process.

Implications and Significance

• The results suggest that the method involving prostaglandin F2 alpha injections three weeks post-partum (used on Group C) may be the most effective for synchronizing estrous cycles in Arabian mares. It also led to the highest first cycle pregnancy rates.
• The results of this study could be beneficial for the equine breeding industry, enabling improved scheduling of insemination and potentially increasing pregnancy success rates.