Golden hamsters were selected for large and small testis size measured in the live animals. Selection response was evaluated with the divergence between large (L) and small (S) lines for testis size. In male traits, the differences of testis size, testis weight, 13 week and 19 week body weight were statistically significant at 11 level, after generation 2 onward. Realized heritability of testis size was O.^+O.O1* for upward selection. In female traits, the ovulation rate also diverged between lines after generation 4. Significant differences of the ovulation rate at 5% level were detected at generation 6 and 7. Litter size at 1 day after birth also diverged between L and S lines, but not distinctly.

T. Furukawa, H. Tanaka, T. Awata

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 203–208, 1986
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