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In order to rank the individual selection candidates for the breeding goal traits it is necessary to comprise the values for the respective traits into one single selection criterion. The value of this criterion can be obtained by summing up the breeding value for each trait multiplied by a weighing factor based on the relevance of that trait in the breeding goal. The relevance might be based on the relative economic value of the trait. This principle is outlined in the slide below:

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Definition

The Breeding value is the mean genetic value of an individual as a parent  for a trait. It is estimated as twice the average superiority of the individual’s progeny relative to all other progeny under conditions of random mating

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