Three lines of mice consisting of 20 pairs of mice were selected for seven generations on performance in the first litter as follows: Line A- Total weight of litter weaned per gram of dam body weight at nine weeks of age; Line B- Number of young born alive per gram of dam body weight at nine weeks of age; Line C- random selection. Realized heritability estimates for NB/D9W were 0.16-0.07, while for TWW/D9W the estimate was 0.02-0.02. The correlated selection responses for NB and D9W were in the desired directions with selection for NB/D9W. However selection for TWW/D9W resulted in correlated responses both in the positive direction. Possible explanation for these direct and indirect responses are discussed in the paper.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 221–227, 1986
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