Average daily TDN intake (F), average daily gain (G) and the ratio gain/TDN intake (G/F) of 766 purebred Angus and 377 purebred Hereford bulls that were individually fed for 140 days postweaning were analyzed to estimate genetic parameters of interest. The data sets included two or more progeny from 39 Angus sires and 32 Hereford sires respectively that were fed in 38 gain tests over a period of 28 years. Estimates were obtained separately for each breed from a mixed model analysis with tests considered fixed, sires considered random and the linear effects of initial age and the linear and quadratic effects of initial weight included as covariates.T he heritability estimates for F, G and G/F were .18 _+.06, .28j^.07 and .20^.06 for Angus and .lljf.08, . 19+.09 and .36_+.10 for Herefords, respectively. Genetic correlations between F and G were .84T.09 and .50+.41 for Angus and Hereford, respectively. Phenotypic and environmental correlations were also high and positive. Correlations were higher between G and G/F than between F and G/F.

C. J Brown, Z. Johnson, A. H Brown

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 291–295, 1986
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