MGA Feeding System에 의한 발정 동기화 방법이 한우의 발정 발현율과 수태율에 미치는 영향

서지정보

· 발행기관 : 한국수정란이식학회
· 수록지 정보 : Journal of Embryo Transfer / 21권 / 3호
· 저자명 : 이명식, 정영훈, 박수봉, 임석기, 박정준, 정진관, 문승주, 김창근

초록

본 연구는 투여에 의한 발정 동기화 방법이 한우의 혈청 수준, 발정 발현율과 수태율에 미치는 영향을 규명하고자 수행하였다. 첫째로, 한우 미경산우에서 투여가 혈청 수준에 미치는 영향을 조사하기 위하여 한우 미경산우 10두 및 프리마틴 1두에 대하여 MGA를 1일 0.5 mg을 14일간 오전 배합 사료에 섞어 급여하였으며, 19일이 경과한 후에 25 mg을 투여하였다. MGA feeding 후 혈청 농도 수준을 분석하기 위하여 MGA 급여 기간과 급여 종

영어초록

This study was conducted to investigate the effects of melengesterol acetate (MGA) and administrations on serum progesterone level, synchrony of estrus and conception rates in Han-woo. Firstly, ten heifers and one freematin were fed 0.5 mg MGA/day for 14 days in a grain carrier, and after 19 days of MGA feeding, a single injection of 25 mg were treated. Blood samples were collected to evaluate serum progesterone concentrations from the start of feeding of MGA until the end of feeding and subsequent estrous detection and artificial insemination (AI) at 3 days intervals, and on days of injection, estrous detection, AI, and 15th and 60th days after AI. The level of progesterone in the blood began to increase from 7 days after MGA feeding, and 9 days after feeding it became 5.4 ng/ml and maintained that level thereafter. On the 33th day when the was injected, it reached the peak level of 7.6 ng/ml. However, 2-3 days after injection, it dropped to 1.4 ng/ml drastically (p<0.05). Secondly, one hundred and ninety four Hanwoo heifers or cows were divided into two groups to compare estrous induction and conception rates: the one treated with MGA and , (n=104) and the other with treatment (two injections at 11 days interval, n=90). The heifers or cows treated with MGA and were identical to those used as above. The percentages of heifers or cows showed estrus were higher in the treatment (91.3%) than in the treatment (72.2%, p<0.05). Conception rates were also higher in the treatment (94.2%) than in the treatment (88.9%, p<0.05). The results of this experiment indicate that estrus synchronization using is more effective than that using (two injections) in Hanwoo.

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