Studies on Intensity Of Selection On Response and Correlated Response In Mice
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Date
1999
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Birsa Agricultural University, Ranchi
Abstract
(1) The heritability of litter size at weaning was medium in magnitude while 6-wk. weight and tail length moderate in the base population. Litter size at weaning had negative genetic and phenotypic association with 6-wk. weight and tail length. However, the relationship (genetic and phenotypic) between weight and tail length at 6-wk. was positive and high in magnitude significant.
(2) Heritability estimates for 6-wk. weight were moderate to high in magnitude in different line and generation, while were medium to high in magnitude for 6-wk. tail length, indicating scope of further improvement by selection.
(3) In selected lines, heritability estimates for weaning litter size were low in magnitude indicating that improvement is possible by exploiting non-additive genetic variance.
(4) Negative phenotypic and genetic correlations of weaning litter size with body weight and tail length at 3 and 6-wk. of age, further confirmed negative association between them.
(5) The direct response in 6-wk. weight was markedly high with 50% level of selection than that of 75 % level of selection. Whereas observed response in 6-wk. tail length was also high with 50% level of selection. than that of 75 % level of selection for 6-wk. tail lenght.