A Comparison on Selection Approaches for Japanese Brown Cattle Based on Profitability

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  • 利益に基づく褐毛和種の選抜法の比較
  • リエキ ニ モトズク カツモウワシュ ノ センバツホウ ノ ヒカク

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Abstract

Two approaches for predicting the genetic merits of breeding animals for profitability of their progeny were investigated and compared. The first was an indirect approach which predicts breeding values for individual traits and calculates an aggregate genotype in the breeding goal as a linear combination of the predicted breeding values and economic weights for components of profit. The breeding animals are selected based on the calculated aggregate genotype. The second was a direct approach which directly predicts breeding values for profit by regarding profit as a single trait, and the breeding animals are selected based on the predicted breeding values for profit. The field records on Japanese Brown steers marketed from 1989 to 1993 in Kumamoto Prefecture and their pedigree information were used in this study. Profit and carcass unit price were taken as interests of selection (aggregate genotypes). In the indirect approach, the traits considered were daily gain during fattening period (DG), marbling score (BMS) and rib-thickness (RT). The effects of between-year differences of economic weights on the aggregate genotypes (i. e., profit or carcass unit price) were small. The correlation between aggregate genotypes (profit vs. carcass unit price) increased with the year. On the other hand, in the direct approach, estimates of heritability for profit and carcass unit price were 0.41 and 0.49, respectively. The correlations between the aggregate genotypes from the indirect approach and breeding values from the direct approach for sires were 0.919 for profit and 0.945 for carcass unit price. The same correlations for dams were 0.834 for profit and 0.880 for carcass unit price. It was suggested that the direct approach may be useful for selection of breeding animals (especially sires), because the approach required easier analysis (single trait analysis) and fewer genetic parameters (only heritabilities) than the indirect approach.

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