Two mouse populations, a cross of four inbred strains (population A) and outbred albino mice (population B) were mass selected in divergent directions for eight weeks body weight and 3 to 5
 weeks body weight gain over 12 generations, with two replicates each. In the basepopulations males and females were alloted randomly to selection lines with one replicate and control lines with two replicates. Thereafter each line was maintained as a closed population and was bred from eight single pair matings in each generation. The litte rs were standardized in population A to eight and in population B to ten at the day of birth. We weaned the mice 21 days after birth and recorded individual weight to the nearest one tenth of a gram at three, five and eight weeks of age. Heritability estimates for the body weight traits in the unselected basepopulations are given in Table 1 .

I. von Butler, H. Willeke, F. Pirchner

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 76–79, 1982
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