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Mendelian sampling. This introduces a chance factor, even if you know the EBV for father and mother very accurately.
Pleiotropic (one gene affects multiple traits) and epistatic effects (gene-gene interactions). It is possible that a trait, for example gait quality in horses, is affected by a gene that interacts with another gene. If one of those genes has the wrong allele in the offspring then the gaits won’t be improved.
What is the accuracy of the information that the selection decision is based on? For example, does genetic or training make a champion? You should especially ask yourself such questions in the absence of an accurate EBV.
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Thus: compensatory mating involves finding the best mate for individual females to compensate her shortcomings. Compensatory mating may have an effect on individual mating results, but has not effect at population level. |