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- 저자 : 정선부 (검색결과 154 건)
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정선부 충남대학교 대학원 1971 논문집 Vol.3 No.-
The purpose of this study was to investigate the methods of early selection for effective improvement of various economic traits in laying hens. The data used in these studies were the records of 1058 New Hemp-shire hens which were raised at Tajon Branch Station of National Aminal Breeding Station for 5 years from 1965 to 1969. Heritabilities and maternal variances were estimated by the method of variance component analysis for 15 economic traits. Phenotypic, genetic and environmental correlations among these traits were also estimated. The results obtained are asfollows. 1. The heritabilities estimated were 0.31 for body weight at 8 weeks, 0.46 for body weight at age at first egg, 0.34 for body weight at 300 days, 0.39 for body weight at 500 days, 0.31 for intensity of egg production, 0.44 for winter pause, 0.36 for egg weight, 0.55 for age at first egg, 0.40 for egg production to 200 days, 0.50 for egg production to 250 days, 0.60 for egg production to 300 days, 0.62 for egg production to 350 days, 0.57 for egg production to 400 days, 0.56 for egg production to 450 days and 0.46 for egg production to 500 days. 2. The fraction of the total variance which due to the maternal effect was 0.18 for body weight at 8 weeks, 0.108 for body weight at age at first egg, 0.08 for body weight at 300 badys, 0.28 for winter pause, 0.11 for age at first egg, 0.18 for egg weight and 0.08 for number of egg production to 200 days of age. 3. The genetic correlations of body weight at 8 weeks of age with body weights at different ages, number of egg production, egg weight and winter pause were positive, but correlations of body weight at 8 weeks with age at first egg and intensity of egg production were nagative. There were positive genetic correlations for body weight at age at first egg with body weight at each stage, egg weight and age at first egg. In the genetic correlations between body weight at first egg and number of egg production, negati e correlations were found in early stages of egg production but in late stages, the correlations turned to positive. There were positive genetic correlations for body weight at 300 days with body weight at 500 days, egg weight and age at first egg, but the body weight at 300 days was negatively correlated with number of egg production in all stages. Genetic correlations for body weight at 500 days with intensity of egg production, egg weight and number of egg production at each stage except for egg production to 500 days were positive. The genetic correlations of egg production to 500 days with egg production to 200 days, to 250 days, to 300 days, to 350 days, to 400 days, and to 450 days were 0.44, 0.66, 0.55, 0.69, 0.87 '0.97 respectively. 4. On the basis of the results obtained in this study, it is recommended that for the effective improvement of egg production, selection should be practiced for bodyweight at 8 weeks of age at first, selection at next stage be practiced for age at first egg, and then for egg production to 300 days of age.
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정선부 대한양계협회 1983 월간 양계 Vol.15 No.1
닭의 개량이 선진국에서만 가능한 것이 아니고 우리도 자금을 투입해 체계적인 육종사업을 실시한다면 발전의 무한한 가능성을 지니고 있다.
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정선부,정일정 한국가금학회 1983 韓國家禽學會誌 Vol.10 No.2
본 연구는 육용계의 복강지방 축적에 대한 결합능력추정을 위하여 White Cornish 2계통과White Plymouth Rock 2계통을 상호 역교배시켜 16개 교배조합을 생산하여 각 교배조합당 60수씩 960수를 혈통번식시켜 2주 간격으로 체중, 복강지방량 및 체중에 대한 복강지방 비율에 대한 결합능력을 추정하였다. 1. 육계의 복강지방량의 생체중 대 비율은 4주영부터 암탉이 수탉보다 높았다. 2. 일반결합능력에 있어서 체중은 암수 공히 각주령에 유의성이 있었으며 복강지방량에서 암탉은 2. 8, 10 및 12주령에 유의성이 있었고 수탉은 2, 6 및 12주령에 유의성이 있었으며 복강지방의 생체중 대 비율에서는 암탉은 10 및 12주령에 유의성이 있었으나 수탉에서는 유의성이 없었다. 3. 특수결합능력에서 체중은 암탉에서 4, 6, 10 및 12주령 수탉에서 4, 8, 및 12주령에 유의성이 있었으며 복강지방량은 암탉에서 4, 8, 10 및 12주령에 유의성이 있었으나 수탉에서는 유의성이 없었으며 복강지방의 생체량 대 비율은 암탉에서 4 및 8주령에 유의성이 있었으나 수탉에서는 유의성이 없었다. Sixteen crosses from two strains of White Cornish and White Plymouth Rock were reared seperately on floors and abdominal fat was measured every two weeks interval from two weeks to twelve weeks of age. The abdominal fat weights surgically removed were slightly heavier in female than male. Estimates of general combining ability variances of body weight showed significant at all weeks of age in both sexes but those of abdominal fat weight were significant at 2, 8, 10 and 12 weeks of age in female and 2, 6 and 12 weeks of age in male. In percentage of abdominal fat to body weight, the significant differences were observed at 10 and 12 weeks of age only in female. The specific combining ability variances were significant at 4, 6, 10 and 12 weeks of age in female and 4, 8 and 12 weeks of age in male in body weight. In abdominal fat weight, there were significant differences at 4, 8, 10 and 12 weeks of age in female but no significant differences in male. The specific combining ability variances of percentage of abdominal fat to body weight showed significant differences at 4 and 8 weeks of age in female but no significant difference in male.
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정선부 한국가금학회 1988 韓國家禽學會誌 Vol.15 No.2
채란계의 생산성향상은 실용계의 유전적인 생산능력의 개량과 환경 및 사양관리 기술의 개선에 의하여 이루어 질 수 있는데 아무리 사양관리를 잘하여도 그 닭이 가지고 있는 유전적인 생산능력이 좋지 못할 경우 소기의 목적을 달성할 수 없으므로 채란계 산업의 성공적인 경영을 위해서는 생산성이 높은 우수한 계종을 선택하여야 한다. (중략)
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