Estimation of environmental effects on litter size and survival rate and correlation coefficients of the traits between parity sets.
1989
Lee H.K. | Kim I.C.
Environmental effects on litter size and survival rate and correlation coefficients of the traits between parity sets were estimated on the basis of the data from 1,815 litters of Landrace, Large Yorkshire, Duroc and Hampshire raised at National Animal Breeding Institute from 1980 to 1988. Significant effects of breed on total number born were detected in the 1st, 2nd and 3rd parity sets (p <0.01), while the farrowing season showed a significant effect in the 1st parity set only. The litter size at 21 days of age and weaning were effected on the farrowing season and the breed (p <0.01), and sows farrowed in spring showed better performance for those of traits. The farrowing season showed clear effect on survival rate up to 21 days of age. Survival percentages up to 21 days of age in spring, summer, fall, and winter were: 36.04, 92.49, 96.21, and 93.41 in 1st parity set, 94.78, 91.41, 92.20, and 91.50 % in 2nd parity set, 93.36, 91.90, 95.17, and 94.79 % in 3rd parity set, respectively. Correlation coefficients of the traits between parity sets were 0.21 for total number born, 0.19 for litter size at 21 days of age, and 0.24 for litter size at weaning between the 2nd 3rd parity set.
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