One of the greatest limitations to genetic improvement of our livestock for economically important characters is the relative inaccuracy in evaluating the individual animal's transmitting ability. The most complete information on the genetics of the sire or dam, if they are not inbred, supplies limited evidence of the breeding worth of an individual offspring. The individual's own appearance or performance may supply more information on its transmitting ability, but this also usually is far from an accurate guide.
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Tyler et al. (1949) studied this question.
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