Salaction of coua on the basis of a linear discriminant function or aalactlon index la coneidered to ba beat for maximizing 9«*"«tie gain in aggregate monetary value of the genotype of the animals. The index la likely to change with the ehangea in economic value and herite- b lllty of the traits as well as changes in phenotypic and genetic lationa among the traita. It was, therefore, considered useful to investigate the effect of variation in economic values and genetic parameters on the selection index to Judge ite relia bility for wider and prolonged uao. further the efficacy of a aeleotlon index is generally Judged by the extent of correlation (r H» ) between the selection index ( I ) and the net hereditary merit (H)| the*net hereditary merit being the sum of products of economic values and genotypes of various traits* It is , however, more important to Judge the efficacy of the selection index as a basis of aalactlon for maximizing gain in life-tim e profit of the cows. Therefore the second aspect coneidered was to Judge the relia b ility of selection index as baaia of selection for life-tim e economic value of the animals measured as life-tlm a milk production*

A. K Gupta, M. Gurnani

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 100–104, 1982
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