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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.
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.
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.
한우에 있어서 주간 분만유기에 대한 야간 사료급여의 영향
임석기,연성흠,나승환,강수원,박준철,김현섭,정연후 ( S . K . Im,S . H . Yeon,S . H . Na,S . W . Kang,J . C . Park,H . S . Kim,Y . H . Chung ) 한국축산학회 1997 한국축산학회지 Vol.39 No.3
This study was carried out to investigate the effect of evening feeding to pregnant cows(Hanwoo) on calving time during a day. The investigation revealed that feeding at 17:00∼21:00 resulted in 79.8% of the cows calving between 06:00∼21:00, whereas the tradional 08:00∼09:00 and 17:00v18:00 feeding resulted in 59.3% of them calving during the time period (P$lt;0.001). There were no significant differences in the calving time, parity, feed intakes, calving days, and sex ratios between the two feeding practices.
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.
윤호백,김시동,나승환,장은미,이학교,전광주,이득환 한국동물자원과학회 2002 한국축산학회지 Vol.44 No.4
1998년도부터 2001년도까지 실시한 한우 후대검정에서 공시된 후보종모우들에 대한 근친도를 조사해 본 결과, 대부분의 종모우들은 근친되지 않고 있어 한우 종모우 집단은 아직 non-inbred 집단으로 간주해도 무방할 것으로 사료되었다. 하지만 많은 개체들간에 혈연관계가 있는 것으로 조사되어 앞으로 근친도가 크게 상향될 것으로 예상되기 때문에 농가에서 보다 계획적인 정액 선택을 통한 교배가 권장된다. 또한 거세 검정우 1262두로부터 조사된 도체성적들에 대한 유전모수를 선형모형하에서 REML 방법으로 추정된 결과와 근내지방도를 범주형자료로 간주하여 Gibbs sampling 방법으로 추정한 결과, 보다 다소 높게 추정되었으며 GS 방법에 의한 추정치가 REML 방법에 의한 추정치보다 높게 추정되었다. 특히 근내지방도에 대한 유전력 추정치는 GS 방법에서 0.74으로 아주 고도의 유전력을 갖는 것으로 추정되어 근내지방도에 대한 개량의 용이함을 제시하였다. 또한 근내지방도와 등지방두께 간에는 0.46의 유전상관을 갖는 것으로 추정되었으며 근내지방도와 출하시 체중간에는 -0.44의 부의상관을 갖는 것으로 추정되었다. 반면에 도체율과 근내지방도간에는 -0.72의 강한 부의상관을 갖는 것으로 추정되었는데 도체율에 대한 변이가 상당히 낮은 변이계수를 고려할 때 추정치에 대한 신뢰도가 낮을 것으로 예상되었다. 종모우의 육종가에 대한 추정방법간의 상관은 다소 낮을 것으로 예상되기 때문에 이에 대한 연구가 필요한 것으로 사료된다. The data were consisted of 1,262 records for carcass traits observed at Hanwoo steers from 1998 to 2001 at Namwon and Deakwanryung branch of National Livestock Research Institute, Rural Development Administration. Pedigrees of young bulls were traced back to search for magnifying inbreeding. Genetic parameters for carcass traits with Gibbs sampling in a threshold animal model were compared to estimates with REML algorithm in linear model. As the results, most of bulls were not inbred and sire pedigree group was non-inbred population. However, most of the bulls fell in some relationship with each other. Heritability estimates as fully posterior means by Gibbs samplers in threshold model were higher than those by REML in linear model. Furthermore, these estimates in threshold model using GS showed higher estimates than estimates using tested young bulls in previous study and same model. Heritability estimate by GS for marbling score was 0.74 and genetic correlation estimate between marbling score and body weight at slaughter was -0.44. Further study for correlation of breeding values between REML algorithm in linear model and Gibbs sampling algorithm in threshold model was needed.