Disease resistance is an important breeding goal in a selection programme for fish, and genetic variation in resistance is reported. However, disease resistance is difficult to measure. Today, survival rate is recorded, but too many irrelevant factors influence survival. Consequently, survival is not included in the selection criteria. Using family selection it is possible to infect parallels of each progeny groups with diseases and record mortality, but this is costly. The most promising approach seems to be an indirect selection based on parameters in the immune system or stress response parameters when these are correlated to disease resistance
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., , 461–464, 1990
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