Abstract

The method proposed by FALCONER for estimating heritability to disease was extended to the case of hen's liability to laying anormal eggs. Appropriate formulae for calculating heritability and its standard error were presented with a numerical example of double-yolked egg. The heritabilities of liability to laying double-yolked eggs were 0.404±0.223 from full-sib relationships and 0.422±0.341 from half-sib relationships.

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