This study deals with the structure of additive genetic and environmental variation as well as genetic correlations for egg number at different ages in laying hens.The positive genetic correlations between early and late egg production together with an increase in additive genetic,and environmental variation found,give support for some of the theories of ageing.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 77–80, 1990
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