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대요크셔종과 랜드레이스종간 상반교잡이 돼지의 복당산자수와 복당체중에 미치는 효과
박영일(Y . I . Park),이수찬(S . C . Lee),김성훈(S . H . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.5
The reciprocal crosses between Large Yorkshire and Landrace were compared for the litter size and litter weight on the basis of the data from 4,250 litters of pigs furrowed at the S. Swine Breeding Farm from January, 1986 to June, 1993. The Y×L cross produced by Landrace darns was significantly heavier than the L×Y cross produced by Large Yorkshire dams by 1.61±0.18 ㎏ for the litter weight at birth and by 5.17±0.64 ㎏ for the litter weight at 3 weeks. The Y×L cross had larger litter size at 3 weeks of age by 0.18±0.09 than the L×Y cross, but the difference between the reciprocal cross was statistically insignificant for the litter size at birth. The superiority of Y×L cross over the L×Y cross in the litter weight at birth was significantly reduced in the 9th parity and later as compared to other parities, which reflected the significant interaction between reciprocal crossing arid parity for this trait. The effect to of parity, year of birth and month of birth were also estimated.
백색 Leghorn 종 산란계 계통에 있어 경제형질에 대한 유전적 변화 추세의 추정
박영일,이수찬,서강석,김태훈,정기홍,조용민,이일주,김상용 한국축산학회 1999 한국축산학회지 Vol.41 No.3
Genetic trends on six economic traits were estimated in a line of White Leghorn layers selected over a period of 11 generations from 1976 to 1989 on the basis of the data from 7,602 cocks and 24,392 hens. The average selection differential per generation over the period was -2.59 days for age at first egg, I1.9 eggs for egg production to 43 weeks, 5.70 eggs for egg production from 44 to 57 weeks, 0.73 g for egg weight at 30 weeks. 0.5 i g for egg weight at 40 weeks, and 0.55 g for egg weight at 60 weeks. The animal model was used for the prediction of the breeding value for each trait. The estimated average changes of breeding value per generation over the generations 0-11 were -0.27 day for age at first egg, 1.38 egg for egg production to 43 weeks, 0.52 egg for egg production from 44 to 57 weeks, 0.28 g for egg weight at 30 weeks, 0.26 g for egg weight at 40 weeks, and 0.22 g for egg weight at 60 weeks. In view of the results obtained in this study, a substantial amount of genetic improvement in the six traits appeared to have been achieved in the line by selection for higher egg production, heavier egg weights and for lower age at first egg.