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Basic studies on development of excellent strains in japanese beef cattle 2. genetic and environmental effects on preweaning growth of japanese brown calves



Basic studies on development of excellent strains in japanese beef cattle 2. genetic and environmental effects on preweaning growth of japanese brown calves



Proceedings of School of Agriculture Kyushu Tokai University (3): 15-22



Genetic and environmental effects on birth weight, preweaning daily gain and adjusted 180 day weaning weight in Japanese Brown calves were studied. The records of 239 female and 235 male calves (castrated at 3 mo. of age) were collected from Aso branch of Kumamoto National Livestock Breeding Station from 1962-1978. The effects of year, sires within year, sex of calf, calving number of dam, season of birth, sex .times. calving number and sex .times. season of birth were analyzed by the least-squares analysis procedures described by Harvey. Effects of year were significant on birth weight and weaning weight. Effects of sex of calf and calving number were highly significant on each trait. Male calves were 2.7 kg heavier in birth weight, 0.047 kg in preweaning daily gain and 11.2 kg in weaning weight than were female calves. Calves with calving number of 5-7 showed the highest values for each trait. Calves born in winter were heavier than those born in other seasons in preweaning daily gain and weaning weight. Interactions between sex and calving number, and between sex and season of birth were not observed. Estimates of heritability, and phenotypic and genetic correlation coefficients were calculated from the variances and covariances by paternal half-sib analysis. Heritability estimates for birth weight, preweaning daily gain and weaning weight were 0.74, 0.42 and 0.36, respectively. Genetic and phenotypic correlations of birth weight with preweaning daily gain and weaning weight were low, while preweaning daily gain showed high genetic correlation with weaning weight. Repeatability estimates obtained by maternal half-sib correlation method were 0.19 for birth weight, 0.24 for preweaning daily gain and 0.27 for weaning weight.

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