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Studies on the outdoor feeding for winter season by korean native reproductive cattle ii. effects of wintering sites and nutritional levels on the body weight changes and reproductive performances of nursing cows and calves for winter season



Studies on the outdoor feeding for winter season by korean native reproductive cattle ii. effects of wintering sites and nutritional levels on the body weight changes and reproductive performances of nursing cows and calves for winter season



Korean Journal of Animal Science 30(2): 65-73



This experiment was carried out to investigate the effects of wintering sites and nutritional levels on the body weight changes and reproductive performances of Korean Native Nursing Cows and Calves for winter season. Eighty four heads of nursing cows and calves, respectively, were kept at three different wintering sites (housed, outside and woody land) and two nutritional levels (100 and 150% of NRC recommendation) for 120 days every year from Nov. 30. 1982 to Mar. 29. 1985, in Alpine Experiment station, Daegwallyoung, Korea. The results obtained were summarized as follows: 1. When the nursing cows were wintered at three different wintering sites with two nutritional levels, the body weight of the housed group was more slightly increased than any other group, but there was not significantly different among them. However, in the nutritional levels, the body weight of the nursing cows fed at 150% level of NRC recommendation was significantly higher (P < 0.05) as compared with that fed at 100% level of NRC and being compared the housed feeding with the outdoor feeding, it was appeared to be effect of the shelter (the housed feeding) in low level of nutrition (100% of NRC recommendation) but no in high level of nutrition (150% of NRC). 2. Effects of the high nutritional levels on the body weight gains at nursing cows for the wintering period were not prolonged until the time of ad libitum by grazing and the gains that were decreased or not sufficient in low nutritional levels was much more compensated than the high nutritional levels during the grazing season so that the total gains from wintering period to grazing season was tend to the same. 3. The wintering sites and the the nutrition levels of nursing cows did not influence the body weight changes of fall calves for wintering season, and it is supposed that the suckled milk or heritability is more highly affected than the supported feed in the gain performance of suckling calves. 4. Being off the wintering season, it was appeared that the reproductive rate of nursing cows in outdoor feeding group was slightly higher than the housed feeding group, and in low level of nutrition than in high level of nutrition.

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