生産・肥育地帯での肉牛成績による種雄牛の産肉能力に対する現場後代検定の可能性

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The possibility of assessing the breeding value of active sires in terms of the marketing performance of their progenies which were marketed by many individual fatteners was examined. Factors affecting performance of steers were also studied. Multiple regression analyses were conducted for marbling score as a function of age of slaughter and final weight, and for carcass merit as a function of final weight and other carcass characteristics. The data used in the analysis were collected on 224 steers from 13 sires at Osaka Central Market from 1971 to 1974. They were marketed from three regions of Oita prefecture. A least squares analysis with regression was carried out as described by HARVEY. Each trait was classified by the region at which the steer had been fed, by year in which that was marketed and by age at marketing. Most of the traits were affected significantly by year and by interaction between region and year. Significant partial linear-regression coefficients of final and carcass weight on slaughter age were found. None of the traits was affected significantly by differences between sires. Therefore, their heritability estimates were low. The results of multiple regression analysis based on step-wise method indicated that the greater part of the variation in marbling score was attributable to differences between ages of slaughter rather than those between final weights. Marbling score was the most important predictive variable for carcass merit. The effectiveness of "on-farm progeny testing" in selecting genetically excellent sires is uncertain.
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生産・肥育地帯での肉牛成績による種雄牛の産肉能力に対する現場後代検定の可能性

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