Studies on the Pure-Bred Korean Native Cattle of Chonnam Area: I. Reproductive Performance

Lee, Chung-gil; Wee, Sung-ha; Park, Seung-joo

Korean Journal of Veterinary Research 1987;27(1):137-140.

Chung-gil Lee¹, Sung-ha Wee², Seung-joo Park²

¹Department of Veterinary Medicine, College of Agriculture, Chonnam National University
²Suncheon Branch, Chonnam Animal Health Station

전남지방(全南地方) 순수번식단지(純粹繁殖團地)의 한우(韓牛)에 관한 연구(硏究) : I. 번식상황(繁殖狀況)

이정길¹, 위성하², 박승주²

¹전남대학교 농과대학 수의학과
²전남가축위생시험소 순천지부

Abstract

Information on certain reproductive traits were obtained from field material. The data for this study were taken from 1,111 breeding records of 273 cows and 193 heifers at Koheung, Chonnam, during the period 1979 to 1984. The cattle were bred by artificial insemination; only one or two cattle were reared by one farmer. The heifers were first bred at 551.75 days after they were born; they were pregnant at 569.06 days after birth. The average estrous cycle length was 21 days; the average number of inseminations per conception was 1.56. The non-return rate for first inseminations for cows and heifers was 62.5% and 59.6%, respectively. The gestation length was 285.79 days. Of 1,111 viable calved born 582 were male, giving a sex ratio of 100:110. The average length between calving and first insemination was 88.9 days; average calving interval was 397.69 days.