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토끼에 있어서 번식능력에 영향을 미치는 품종및 환경요인에 관한 연구
이학교(H . K . Lee),류충현(C . H . Ryu),최진성(J . S . Choi),강만석(M . S. Kang) 한국축산학회 1988 한국축산학회지 Vol.30 No.12
This study was conducted to estimate the effect of breed. year of kindling, season of kindling and month of age at kindling on the reproductivity in does. The data used in this study were obtained from total 4,024 litters of New zealand white (2,302 litters) and Californian (1,722 litters) raised at the Animal Breeding Institute from 1978 to 1986. The results obtained are summarized as follows: l. Significant (P$lt;0.05) differences were detected for born number, litter size at 21-day and at weaning among the breeds, kindling seasons and years, respectively. Except for growth rate from birth to 21 days of age, linear regression for month of age at kindling affected litter size and growth rate significantly (P$lt;0.01). 2. Breeds affected kitling weight at 21-day and at weaning significantly (P$lt;0.01). Years and seasons affected litter weight at 21-day and at weaning significantly (P$lt;0.01). 3. Breeds affected gestation length significantly (P$lt;0.01). The gestation length least-square means were 31.2±0. 18 and 31.8±0.27 in New zealand, Californian breed, respectively. Breed and season affected within-litter uniformity significantly (P$lt;0.01). Least-square means of within-litter uniformity over all litters studied was 12.0+1.12%.
토끼에 있어서 번식형질 (繁植形質) 에 대한 유전적 모수 추정
이학교(H . K . Lee),류충현(C . H . Ryu),최진성(J . S . Choi),박태진(T . J . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.7
This study was conducted to estimate genetic parameters on the reproductive traits in does. The data used in this study were obtained from total 3.939 litters of New zealand White and Californian tested from 1978 to 1986 at National Animal Breeding Institute. The results obtained are summarized as follows ; 1. On New zealand White and Californian breed. general performance were 7.63±0.03 and 7.31±0.04 for litter size at birth, 6.93±0.03 and 6.78±0.14 for litter size at 21 days, 2.05±0.01 ㎏ and 2.04±0.01 ㎏ for litter weight at 21 days, and 90.13±0.33% and 92.15±0.39% for survival to 21 days, respectively. 2. Estimates of heritabilities were 0.13±0.021 for litter size, 0.084±0.018 for litter weight at 21 day, 0.121±0.018 for kitling weight at 21 days, 0.040±0.013 for survival to 21 days and 0.079±0.015 for gestation length. 3. Genetic (phenotypic) correlations of litter size at birth with litter weight at 21 days and survival to 21 days were 0.353(0.279) and -0.572(-0.496) and those of litter weight at 21 days with kitling weight at 21 day and survival to 21 days were 0.213(0.332) and 0.319(0.238) and those of kitling weight at 21 days with within-litter uniformity and survival to 21 days were 0.525(0.068) and 0.721(0.128).
류충현,한유희,이영신,서정 한국레이저가공학회 1998 한국레이저가공학회지 Vol.1 No.1
The electron beam welding system has the advantages of the high power density, narrow welding section, and small thermal distortion of a workpiece. recently, the electron beam welding system is widely used to the airplaned engineering, nuclear power plant, and automobile industry. In the present paper, the structural analyses on the vacuum chamber of the electron beam welding system are performed by the F.E.M. analysis. The stiffening characteristics on the geometric shape, stiffener height and stiffener span are investigated. The deflection of the stiffened vacuum chamber under pressure is minimized by longitudinal and transverse stiffeners which are continuous in both direction.