The specific sets of environmental factors-both natural and artificially controlable - and their combinations under which the genetically different poultry populations are maintained are practially infinite/feeding, housing, climate, density, cage designs etc. All of them influence the various production traits additivvely and in many situations interactions between the environmental factors have a significant effect on the trait in question too.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 699–708, 1982
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