The selection of chickens for a variety of production traits is one of the triumphs of quantitative genetics, and an important current goal is to find genes that confer better immunity to all diseases. The molecular arms race between pathogens and hosts means that there are complications, including the expectation that genes conferring resistance to one pathogen may confer susceptibility to another pathogen. In addition, co-evolution between closely-linked genes and epistasis between unlinked genes means that combinations of particular alleles may be required for optimal responses.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 07.02, 2006
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