Economic efficiency of Japanese black cattle selection schemes utilizing crossbreeding with the holstein breed
2006
Kahi, A.K.(Kyoto Univ. (Japan)) | Hirooka, H.
The economic efficiency of Japanese Black (JB) cattle selection schemes utilizing crossbreeding with the Holstein (H) breed was evaluated in the context of maximizing profitability. Selection schemes were defined that differed in the records available for use as selection criteria. The selection schemes were assessed based on profitability per cow in the JB cattle population. Within each selection scheme, two terminal crossbreeding systems were considered: two-way crossbreeding without backcrossing (F1 system) and two-way crossbreeding with backcrossing (F1 cross system). The impact on profitability of varying number of sires selected per year and the proportion of H cows that were inseminated by JB semen and of F1 females that are retained for replacement was examined for all selection schemes. Utilizing crossbreeding with the H breed was less profitable than purebreeding of the JB. Profitability was higher in the F1 system than in the F1 cross system in all selection schemes. Profitability was influenced more by changes in the number of sires selected per year than by the proportion H cows that were inseminated by JB semen and of F1 females that were retained for replacement. Implications of these results for the JB breeding program are discussed.
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