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- 저자 : 정연후 ( D . H . Baik (검색결과 4 건)
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한우의 경제형질에 관한 연구 1 . 출생년도 및 계절의 영향
백동훈,신원집,나승환,정연후 ( D . H . Baik,W . J . Shin,S . H . Na,Y . H . Chung ) 한국축산학회 1985 한국축산학회지 Vol.27 No.7
Data obtained from the total of 683 calves (351 males and 332 females) were analyzed to study differences in economically important traits of Korean native cattle among years and seasons of birth. The calves were born in the Alpine Experiment Station from 1970 to 1983 and reared to 24 months of age for the progeny test of their sires. Average weights were 24.5, 86.7, 117.0, 239.6 and 320.7 ㎏ at birth, 4, 6, 12 and 18 months of age, respectively. Year of birth was an important source of variation for all of the traits studied. The body weights were getting heavier as the year of birth elapsed except for the years 1977, 1978 and 1979. Digestible CP and TDN were varying over the years. Season of birth was a significant source of variation for the weights at birth and 4 months of age but for the weights at 6, 12 and 18 months of age, it failed to show significance. Calves born in fall had lightest weights at all of the age periods classified in this study. The CP and TDN consumption showed to have higher in spring and winter born calves.
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한우 포유모우의 산유량및 유조성분에 관한 연구 1 . 포유모우의 산유량 추정방법 확립에 관한 연구
강수원(S . W . Kang),정연후(Y . H . Chung),정창화(C . H . Chung),나승환(S . H . Na),손용석(Y . S . Son),백동훈(D . H . Baik) 한국축산학회 1989 한국축산학회지 Vol.31 No.3
This experiment was conducted to establish the estimating of dam`s milk producing capacity which forms the basis of Korean Native Cattle improvement for 3 years from 1982 to 1984. Four methods, including weight difference of the calf before and after nursing, hand milking and machine milking were compared with a new milking while the calf nurses, which the good points from the existing methods were extracted and then were developed. Fifty nine heads of nursing cow were tested to investigate dam`s milk yield. dam`s milk composition by the new milking method for 3 years from 1985 to 1987. The results of this experiment are summarized as follows: 1. This new method was made to use a portable vacuum·operated bucket milker in two quarters of each cow`s left or right udder while the calf suckles two quarters of his or her dam`s right or left udder. On this method. cows and calves were seperated at 8:00 am and at 5:00 pm the calves allowed to nurse. Cows and calves remained seperated over night. At 8:00 am and 5:00 pm the following day, the calves allowed to nurse one udder half while the rest was milked by machine. 2. On the comparison with methods estimating dam`s milk yield, the method by calf-weight difference before and after nursing wasn`t exact and good method in estimating dam`s milk yield and composition because not only this method was indirectly estimated by calf`s weight gain but also milk sample could not be taken. And also, the method by hand milking and machine milking could be surveyed only 60 days and 4 to 10 days, respectively, because dam`s milk yield was rapidly decreased with passing the milking day. However, by the new method, milking could be completely done without failure for 180 days and samples for analyzing the milk composition could be taken more easily and exactly than any other method. 3. Daily average and total milk yield of fifty nine heads investigated by this new method for 180 days was 3.48 and 625.8kg, respectively. 4. In the milk composition, total solids, far, protein, lactose and ash content was 14.21, 4.64, 4.07, 4.21 and 0.89 percent, respectively.
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나승환(S . H . Na),백동훈(D . H . Baik),정연후(Y . H . Chung),나종삼(J . S . Na) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
This study was carried out to investigate the relationship between body weight and body measurements by pre- and postweanig age. Data used for this study included the records of a total of 986 heads of Korean Native Cattle raised in Alpine Experiment Station from 1974 to 1988 The determinant coefficients(R-) of final steps at pre- and postweaning age obtained from stepwise regression anlysis in hulls were (0.97 and 0.87, respectively, and for heifers they were 0.94 and 0.77 respectively. At pre- and postweaning age, chest girth and body length turned out to have high contribution to the body weight in bulls. For heifers, however chest girth and withers height at preweaning and chest girth. rump width. chest depth and hipbone width at post-weaning turned out to have great contribution to the body weight, respectively.
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나승환(S . H . Na),백동훈(D . H . Baik),신원집(W . J . Shin),정창화(C . H . Chung),정연후(Y . H . Chung),강수원(S . W . Kang) 한국축산학회 1992 한국축산학회지 Vol.34 No.1
This study was carried out to investigate the effects of the environmental factors on economically important traits of Korean Native Cattle. The traits studied were body weight, body length and chest girth. Data used for this study included the record of a total of 986 heads of Korean Native Cattle raised at Alpine Experiment station located in Kangwon province from 1974 to 1988. The results obtained in this study were as follows ; Overall least square means and standard errors for body weight of the bull at birth, 6, 12 and 18 months of age were 25.9±0.18, 130.9±1.01, 322.1±1.74 and 453.2±3.20㎏, respectively. The body weights of heifers were 23.9±0.21, 112.9±1.44, 175.3±2.34 and 229.0±3.31㎏, respectively. The least squares means and standard errors for body length and chest grith showed the range of 57.4±0.23∼142.9±0.46 and 68.2±0.22∼184.2±0.59㎝ through overall months of age in bulls, respectively. Those computed from the female showed the range of 56.2±0.33∼118.9±0.59 and 66.6±0.29∼146.7±0.78㎝, respectively. The effects of year of birth showed significant differences for most of traits. The effect of season was significant for body weight at 12 and 18 months of age in bulls, body weight at 6 months, body length at birth, 6 and 12 months and chest girth at 6 months of age in heifers. The parity effects were significant only for body weight at 12 months of age in heifers and chest girth at 12 months of age in bulls. The effect of dam age was not significant for body weight at 18 months in bulls and 12 months in heifers and was not significant for chest girth at birth in bulls and chest girth at birth, 12 and 18 months in heifers.
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