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KMID : 0900919990230030183
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Korean journal of Animal Reproduction
1999 Volume.23 No. 3 p.183 ~ p.189
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Effects of Environmental Factors on Gestation Length and Birth Weight in Korean Native and Yanbian Yellow Cows
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Chung Jin-Woo
Ko Yeoung-Gyu
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Abstract
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A study was conducted to estimate the effects of parity of dam, sex, year and season of birth on gestation length and birth weight in Korean native and Yanbian yellow cows. A total of 1,206 reproduction records (587 Korean native cows, 619 Yanbian yellow cows) were collected from Daekwamyeong Branch Institute, National Livestock Research Institute in Korea and Yanbian region in China from 1995 to 1998. The least square means for gestation length and birth weight of Korean native cows and Yanbian yellow cows were 287.3pm0.60 and 282.3pm0.80 days, 24.9pm0.25 and 25.2pm0.24kg, respectively. Gestation length and birth weight were increased significantly as parity of dam progressed in Korean native cow(p＜0.01), but were not significant in Yanbian yellow cow. Birth weight of male calf was heavier than that of female calf in Korean native cow and Yanbian yellow cow(p＜0.01). Gestation length of Korean native cow born male calf was longer than that of Korean native cow born female calf(p＜0.01), but was not significant in Yanbian yellow cow. Effect of birth year on birth weight was significant in Korean native cow and Yanbian yellow cow(p＜0.01), but effect of birth year on gestation length was not significant. Birth weight of spring-born calf was the heaviest and that of fall-born calf was the smallest in Korean native cow and Yanbian yellow cow(p＜0.01).
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KEYWORD
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Korean native cow, Yanbian yellow cow, Gestation length, Birth weight
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