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돼지의 복당산자수와 복당체중에 미치는 교배조합과 산차간 상호작용 의 효과
박화춘(H . C . Park),서강석(K . S . Seo),박영일(Y . I . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.9
This study was conducted to investigate the effect of the interaction between mating type and parity on the litter size at birth, litter size at weaning and litter weight at weaning on the basis of the data from a total of 26,476 litters of Landrace, Yorkshire, Duroc and Hampshire purebreds, 2-breed crosses and 3-breed crosses by these breeds, which were produced at J. Swine Farm located in Kyunggi-do. The data were statistically analysed by least squares method. The results obtained in this study are summarized as follows: 1. The effects of mating type, parity, year of birth, month of birth and the interaction between mating system and parity were statistically significant for litter size at birth, litter size at weaning and litter weight at weaning at 30 days of age. 2. The 3-breed crosses were most superior in all of the three traits studied and the purebreds were most inferior. The 2-breed crosses were intermediate between the 3-breed cross and purebreds in these traits. 3. The three traits studied were most superior in the 3-6th parity and were more inferior in the Ist parity. The performances in the 2nd parity were intermediate between those of Ist and 3-6th parities. The three traits tended to decline as the parity advances. 4. The differences between 3-6th and Ist parities and between 3-6th and 2nd pariteis in the three traits studied were larger in the purebreds than in the 3-breed crosses or 2-breed crosses. This tendency of interaction between mating type and parity was observed also in the comparisons between 3-6th and 9th parities and between 3-6th and 7-8th parities.
순종과 교잡종 돼지의 복당 산자수와 21일령 체중에 근거한 종모돈의 평가
배규한(G . H . Bae),정흥우(H . W . Chung),서강석(K . S . Seo),박영일(Y . I . Park) 한국축산학회 1994 한국축산학회지 Vol.36 No.1
The breeding values of the Landrace boars were estimated bused on the records of the purehred Landrace and the crossbred between Landrace and Large Yorkshire by best linear unbiased prediction(BLUP) and least squares methods for litter size and 21-day weight to study the relationship between the breeding values estimated by the performances of purebreds and crossbreds. The data used in this study were the records of 3.170 litter of the Landrace purebreds and the crossbreds between Landraces and Large Yorkshires farrowed at the J. Swim Breeding Fann in Jeonnam Province from January. 1984 to December. 1991. The correlation between the breeding value, of the boars estimated on the basis of the purebred and crossbred performances by the BLUP was 0.253 for the litter size and 0.801 for 21-day weight. The correlation between the breeding values of the boars estimated on the basis, of the purebred and crossbred performances by the lest squares method was 0.712 fir the litter size arid 0.853 for 21-day weight.