Jeju crossbred에서 계절에 따른 난소주기 변화 연구

• Published in: Journal of animal reproduction & biotechnology (Online) pp. 177 - 182
• Main Authors: 유영주, 손준규(농촌진흥청 축산기술연구소, 박설화, 신상민, 양병철, 성필남, 우제훈, 김남영
• Format: Journal Article
• Language: Korean
• Published: 사단법인 한국동물생명공학회 30.09.2017
• Subjects: 축산학
• ISSN: 2671-4639; 2671-4663

This study was conducted to investigate the ovarian cycle changes of the mare according to the season. Twenty four Jeju crossbred horses(Thoroughbred x Jeju horse) raised in Subtropical Livestock Research Institute, National Institute of Animal Science, RDA were used to identify follicles and corpus luteum with ultrasonography once a week(May 2016~June 2017). Blood samples of experimental horses were collected twice a week for analysis of P4 hormone levels. The mares were considered to have resumed ovarian cyclicity on the day of ovulation if they followed by regular ovarian cycles. Only 13 cases(61.9%) of the total 21cases showed normal ovarian cycle, and 8 cases (38.1%) showed delayed ovarian cycle. Three cases(16.7%) in October, 5 cases(27.8%) in November and 5 cases(27.8%) in December(27.8%) ceased the heat and the remaining 5 cases(27.8%) showed that the estrus was maintained in winter. Horses that stopped estrus ceased the heat until March of next year, and 27.8% were continued the heat during non-breeding season. Eleven cases(61.1%) of 18 cases in April and 2 cases(11.1%) of 18 cases in May returned the estrus. KCI Citation Count: 2