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Economic efficiency of Japanese Black cattle selection schemes utilizing crossbreeding with the Holstein breed
Author(s) -
KAHI Alexander K.,
HIROOKA Hiroyuki
Publication year - 2006
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/j.1740-0929.2006.00335.x
Subject(s) - crossbreed , breed , profitability index , selection (genetic algorithm) , backcrossing , biology , context (archaeology) , zoology , population , microbiology and biotechnology , demography , genetics , business , computer science , gene , paleontology , finance , artificial intelligence , sociology
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 (F 1 system) and two‐way crossbreeding with backcrossing (F 1 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 F 1 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 F 1 system than in the F 1 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 F 1 females that were retained for replacement. Implications of these results for the JB breeding program are discussed.