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RISS 인기검색어
- 검색키워드
- 저자 : 정연후(Y . H . Jung) (검색결과 4 건)
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한우 번식우의 월동기 야외사육에 관한 연구 1 . 월동기 사육환경과 영양수준이 임신우의 체중변화 및 번식능력에 미치는 영향
강수원(S . W . Kang),정창화(C . H . Jung),정연후(Y . H . Jung),이덕수(D . S . Lee),신언익(O . I . Shin) 한국축산학회 1987 한국축산학회지 Vol.29 No.9
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 heads of pregnant cows were kept at three different wintering sites (housed, out side 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: 1. 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 not significantly different among them. However, in the nutrition levels, the body weight of the pregrant cows fed at 150% level of NRC was significantly higher (p$lt;0.01) as compared with that fed at 100% level of NRC and being compared the housed feeding with the out door feeding, it was appeared to have an effect on the shelter (the housed feeding) in low level of nutrition but no in high level of nutrition. 2. Hair length in all testing cattle was some lengthened in January. According as temperature rises, hair length was inclined to be shortened, but there was not significantly different 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. 3. 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 was decreased or not sufficient in low nutritional levels was much more compensated than the high nutritition levels during the grazing season, so that the total gains from wintering period to grazing season was tend to the same. 4. 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 leves. 5. 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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한우 번식우의 월동기 야외사육에 관한 연구 2 . 월동기 사육환경과 영양수준이 포유모우와 독우의 체중변화 및 번식능력에 미치는 영향
강수원(S . W . Kang),정창화(C . H . Jung),정연후(Y . H . Jung),이길왕(K . W . Lee),손용석(Y . S . Son) 한국축산학회 1988 한국축산학회지 Vol.30 No.2
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 caws 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$lt;0.05) as compared with that fed at 100% level of NRC and being compared the housed feeding with the out door 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 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 out door 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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이순복(S . B . Lee),정근기(K . K . Jung),배동호(D . H . Bae),정연후(Y . H . Chung) 한국축산학회 1991 한국축산학회지 Vol.33 No.2
This study was carried out to improve the quality and nutrive value of corn stover. Moisture content of corn stover was 30%o. Seven different corn stover silages added with rice bran(0, 5, 10, 15, 20, 25 and 30%) and 2% urea(DM basis) were made and moisture content of corn stover silage was 65%. After 40 days, corn stover silage added with rice bran were analyzed chemical composition, in vitro dry matter digestibility (IVDMD) and volatile fatty acid(VFA). The resurts obtained are as follow; l. When the rice bran levels were increased, crude protein and crude fat contents were increased(r-=.94**, .98**), ADF and CWC content decreased (r=-.88**, -.88**). 2. When the rice bran levels were increased in 0, 5, 10, 15, 20, 25 and 30%, lactic acids increased in 0.56a, 0.62a, 1.81b, 2.04b, 2.48bc, 3.29d%, but rice bran levels in 25 and 30% were not significant. 3. Above 5% rice bran level, NH₃-N and IVDMD were not significant. 4. When the rice bran levels were increased, propionic acids were significantly increased (p $lt;.01) but butyric acid significantly decreased (p $lt;.01). 5. Corn stover silage above 25% rice bran level result in better quality silage.
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여정수(J . S . Yeo),정일정(I . C . Cheong),정경진(K . J . Chung),정선부(S . B . Chung),정연후(Y . H . Jung),이기복(K . B . Lee),설동섭(D . S . Sul),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.9
Through chromosomal analysis of 109 heads of the Korean Native Cattles, this research was observed results as follows; 1. Six heads(5.5%) were cosisted of two kinds of mosaic chromosomal spreads( I : monosomy, normal and trisomy II: monosony and normal) and these mosaicsms were variated at #29 chromosome. 2. One head was showed supernumery chromosome suggested B-chromosome. 3. 1/29 Robertsonian translocation was not found in the Korean Native Cattles.
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