Acknowledgement
Supported by : 국제원자력기구(IAEA), 한국과학재단
Korean Journal of Veterinary Research (대한수의학회지)
- Volume 33 Issue 3
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- Pages.525-530
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- 1993
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- 2466-1384(pISSN)
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- 2466-1392(eISSN)
The use of plasma progesterone profiles to determine the puberty in Korean native heifers
한우(韓牛)에서 혈장(血漿) progesterone 농도측정(濃度測定)에 의한 춘기발동기(春機發動機)의 확인(確認)
- Kang, Byong-kyu (College of Veterinary Medicine, Chonnam National University) ;
- Choi, Han-sun (College of Veterinary Medicine, Chonnam National University) ;
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Son, Chang-ho
(College of Veterinary Medicine, Chonnam National University)
;
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Suh, Guk-hyun
(National Animal Breeding Institute)
- Received : 1993.04.19
- Published : 1993.07.30
Abstract
Studies were conducted in 13 Korean native heifers to determine the puberty based on plasma progesterone profiles and estrus observations. Blood samples for determination of progesterone profiles were collected from jugular vein twice a week from 8 to 24 months of age, and all heifers werce observed for estrous behaviours twice a day. Heifers attained puberty at 11.3 months of age and 188.5kg body weight as determined by progesterone profiles, whereas the first estrous behaviours were observed at 14.2 months of age and 215.4kg body weight. This result indicates that determination of plasma progesterone profiles could be utilized for monitoring the puberty in Korean native heifers, and one or more ovulations occurred before pubertal heifers showed overt estrous behaviours.