A mouse experiment was designed to examine whether lifetime production can be increased through selection for increased length of reproduction, and data at the first generation were examined to find whether the design is feasible and promising. About 33 out of 100 pairs of breeders are selected at the 6th parity in each of four selected lines while 150 pairs are replaced after the 1st parity in each of four unselected lines. In the selected and unselected lines, litter size is standardized to 8 at birth in two lines but not standardized in the other two lines. Based on the heritability estimate for the length of reproduction, various selection indexes combining the information on relatives were constructed to compare the relative efficiency of the indexes.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 191–196, 1986
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