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Article

J Vet Clin 2003; 20(1): 121-130

Published online March 1, 2003

Effects on Pregnancy of Reproductive Environments by Ultrasonography in Thoroughbred Mares

양영진1, 조길재1, 신상태2, 남치주3

1한국마사회, 2충남대학교 수의과대학, 3서울대학교 수의과대학

Copyright © The Korean Society of Veterinary Clinics.

Abstract

The purpose of this study was to investigate the effect of breeding conditions on reproductive efficiency of thoroughbred broodmares by ultrasonography. The mean age and breeding career of 120 mares used in this study were 11 years old and 6 years, respectively. The average pregnancy rate and embryonic loss rate were 87.5%, 11.8%. The groups that were 8-10 years old, 4-6 years, maiden and mated on May showed the highest pregnancy rate. While mares mated on 1st estrus post partus had the highest ovulation rate but showed the highest embryonic loss rate and he lowest pregnancy rate. And broodmares that had more intrauterine foreign bodies such as cyst and fluid with age and breeding career had represented lower pregnancy rate and higher embryonic loss rate than those having normal uterine condition. These results suggest that the breeding condition and uterine environment of mares had a significant influence on reproductive efficiency.

Keywords: broodmare, pregnancy rate, breeding condition, uterine environment

Article

J Vet Clin 2003; 20(1): 121-130

Published online March 1, 2003

Copyright © The Korean Society of Veterinary Clinics.

Effects on Pregnancy of Reproductive Environments by Ultrasonography in Thoroughbred Mares

양영진1, 조길재1, 신상태2, 남치주3

1한국마사회, 2충남대학교 수의과대학, 3서울대학교 수의과대학

Abstract

The purpose of this study was to investigate the effect of breeding conditions on reproductive efficiency of thoroughbred broodmares by ultrasonography. The mean age and breeding career of 120 mares used in this study were 11 years old and 6 years, respectively. The average pregnancy rate and embryonic loss rate were 87.5%, 11.8%. The groups that were 8-10 years old, 4-6 years, maiden and mated on May showed the highest pregnancy rate. While mares mated on 1st estrus post partus had the highest ovulation rate but showed the highest embryonic loss rate and he lowest pregnancy rate. And broodmares that had more intrauterine foreign bodies such as cyst and fluid with age and breeding career had represented lower pregnancy rate and higher embryonic loss rate than those having normal uterine condition. These results suggest that the breeding condition and uterine environment of mares had a significant influence on reproductive efficiency.

Keywords: broodmare, pregnancy rate, breeding condition, uterine environment