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제주마의 번식과정에 있어서 혈중 Steroid Hormone 수준변화에 관한 연구 1 . 성성열과 발정주기중의 혈중 Estradiol -17β , Progesterone 수준변화
김중계(J . K . Kim),장덕지(D . G . Chang),서문현(M . H . Seo) 한국축산학회 1990 한국축산학회지 Vol.32 No.7
The reproductive status of 428 heads of Cheju pony mares raised on Cheju island was investigated to improve the reproductive efficiency and to get fundamental data for Cheju pony mares. 1. The average ages at the first estrus and the first foaling were 15.1±1.59 and 38.9±5.48 months, respectively, the differences among the feeding farms were great. 2. The average durations of estrus, estrus cycle, gestation period and foaling interval of mares were 5.7±1.81. 20.8±2.42, 333.9±5.41 and 432.6±134.2 days, respectively. 3. The average parturition rate was 60.9% and the differences among the feeding farms were great: The highest parturition rate was 71.4% for Cheju national monumental pony mares. 4. The reccurrence of estrus after foaling excluding and including alternate year foaling were 21.5±19.0, 114.3±133.84 days, respectively. 5. Seasonal variations of estrous mares were 49.4% goes to summer, 45.2% spring, 3.1%, winter and 2.3% autumn.