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돼지에 있어서 品種,産次 및 分娩季節이 産仔數에 미치는 效果
申源執,申源執,申源執 전북대학교 농업과학기술연구소 1983 農大論文集 Vol.14 No.-
Effects of breed, parity and season of farrowing on litter size were estimated on the basis of data obtained from 372 litters(3,545 pigs) of Landarce, Berkshire, Duroc, Yorkshire and raised at the Kimjae Vreeding station over 8 year period from the spring of 1973 to the winter of 1980. Results obtained are summarized as follows: 1. The least square means over all litters studied were 8.13± 0.16 pigs for the litter size alive and 9.09±0.20pigs for the total litter size. 2. The effects of breed showed statistical significance at the 1% level for the both of the traits studied. For both of the traits, Landrace, Duroc and Yorkshire tended to be lager than Perkshire and Hampshire. 3. The effects of parity also showed significant differences at 1% level. The litter size was the smallest for the lst parity and the largest for the 4th parity and over. 4. The effects of farrowing season were not statistically significant for the both of the traits studied. The litter size tended to be lager in those farrowed in the spring and fall than the summer and winter.
돼지에 있어서 생시 (生時) 및 이유시산자수에 (離乳時産仔數) 대한 유전 및 환경적 효과에 관한 연구
신원집 ( W . J . Shin ) 한국축산학회 1984 한국축산학회지 Vol.26 No.2
This study was conducted to determine the effects of breed, parity, year, season and type of service on litter size at birth and weaning in swine. The least square means were estimated from 609 litters of Landrace, Hampshire, Yorkshire and Duroc raised at Swine Farm, Jeil Sugar Co. from 1977 to 1980. The results obtained are as follows: 1. The least square means over all litters studied were 10.32 ± 0.15 pigs at birth, 8.22 ± 0.13 at weaning. 2. The effect of breed showed significant differences at the 1% level in both traits studied. Landrace and Yorkshire tended to be larger than Hampshire and Duroc in both traits. 3. The effect of parity also showed highly significant difference at birth, but not at weaning. The litter size at birth was smallest in 1st parity and increased as the parity progressed. The litter size was gradually decreased after 7th parity. 4. The effect year was highly significant for the litter size at birth, but not significant differences at weaning. 5. The effect of season was not significant in both traits studied. 6. The effect of type of service was not significant in the litter size at birth and at weaning.