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Effects of selection in mice 3. direct response in litter size at birth and correlated changes in 6 week body weight and 6 week tail length



Effects of selection in mice 3. direct response in litter size at birth and correlated changes in 6 week body weight and 6 week tail length



Indian Journal of Animal Sciences 59(10): 1290-1298



One-way sib selection for large litter size at birth in Italian strain of mice was practised to study direct response in this trait as well as correlated changes in body weight and tail length at 6 weeks of age for 6 generations with the help of an unselected control line. The intensity of selection fluctuated between generations. The degree of inbreeding coefficients was almost similar in both the selected and control lines in each generation. The figure showing direct response indicating remarkable progress in litter size at birth. The F6 individuals in the selected line were having 3.05 young ones at birth more as compared to that of the F1s, whereas this difference was -1.46 in the control. The correlated response in 6-week body weight, though disrupted, was quite large. The F3, F4 and F5 males of the selected line were 4.51, 1.97 and 3.57 g heavier over the initial mean weight, whereas the F2, F4 and F5 males of the control were only 1.54, 0.36 and 1.14 g heavier than that of initial weight. In females the pattern of the correlated response in 6-week weight was more or less similar. Pleiotropy was apparently the primary cause of the correlated responses. As regards 6-week tail length both the selected and control lines showed similar irregularity between generations and there was absolutely no correlated response.

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