The reproductive performance of lines of mice selected for 20 generations for either appetite, lean weight or fat percentage is reported. Results indicate that the overriding factors genetically associated with ovulation rate and litter size in mice are lean mass and appetite (or metabolic rate) in relation to lean mass. When male and female pairs from each of the selection lines were intermittently bred several times (post-partum matings were avoided), first litter performance gave a reliable indication of reproductive rate over the 4 parities studied, and there were no line differences in fertility, even among the fat percentage lines where large differences existed in carcass composition.
We suggest that the basic relationships described here for mice will apply in principal to most, if not all domestic animals.

F. D Brien, William G Hill

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 395–400, 1986
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