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Studies on the out door feeding for winter season of korean native reproductive cattle i. effects of wintering sites and nutritional levels on the body weight changes and reproductive performances of pregnant cows for winter season



Studies on the out door feeding for winter season of korean native reproductive cattle i. effects of wintering sites and nutritional levels on the body weight changes and reproductive performances of pregnant cows for winter season



Korean Journal of Animal Science 29(9): 390-398



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 Pregnant Cows for winter season. One hundred fifty head of pregnant cows 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. 12, 1979 to Mar. 12 1982, in Alpine Experiment Station Dae gwall young, Korea. The results obtained were summarized as follows: When the pregnant cows were wintered at three different wintering sites with two nutritional levels, the body weight of the housed group was more slightly increased than those of others, although there was no significant difference among them. However, in the nutrition levels, the body weight of the pregnant cows fed at 150% level of NRC was significantly higher (p < 0.01) as compared with those fed at 100% level of NRC and compared with the housed feeding and the out door feeding, it appeared to have an effect on the shelter (the housed feeding) in low level of nutrition but not on high level of nutrition. Hair length in all testing cattle was lengthened in January. Accordingly as temperature rises, hair length was inclined to be shortened, but there was no significant difference between the wintering sites and the nutritional levels. Therefore, it was supposed that total hair covering per area was more sensitively reacted than hair growing length in environmental changes. Effects of the high nutritional levels on the body weight gains at pregnant cows for the wintering period was not prolonged until the time of ad libitum by grazing, and the gains that were decreased or not sufficient in low nutritional levels were more compensated than the high nutritionel levels during the grazing season, so that the total gains from wintering period to grazing season tended to be the same. As for reproductive performances, if pregnant cows were prevented the incident from the inclination of woody land. Calving rate and calves weaning rate of the pregnant cows in all testing area would not be effected by the wintering sites or the nutritional levels. The wintering sites and the nutritional levels of the pregnant cows did not have an effect on the birth weight and the weaning weight of the spring calves.

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