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EVISCERATED yield, live body weight, and body conformation are important factors to broiler breeders and processors. Phenotypic correlations between the first 2 traits are important to the processor because eviscerated yield is a measure of processing efficiency and is an important factor in marketing cost. Breeders are interested in the heritabilities of these traits and in their genetic and phenotypic correlations. Of particular interest to breeders are the correlations of conformation and live weight with eviscerated weight, because information on the former 2 traits can be obtained without sacrificing the birds. Heritability estimates of body weight at various ages have been reported by numerous investigators. Goodman and Godfrey (1956) in a review of these studies reported a mean heritability estimate of about .3 for live body weight. Lerner et al. (1947) calculated a heritability estimate of .2 for breast angle in 12-week New Hampshires. Godfrey and Goodman (1956) computed mean …
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Siegel et al. (1959) studied this question.
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