Some genetic aspects of feed intake, gain and feed conversion of young bulls on postweaning gain test

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

3rd World Congress on Genetics applied to Livestock Production, Lincoln, Nebraska, USA, July 16-22, 1986 XI Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance: 291-295


Accession: 001462997

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Average daily TDN intake, av. daily gain and the ratio gain/TDN intake of 766 Aberdeen-Angus and 377 Hereford bulls individually fed for 140 days postweaning were analysed. The data sets included 2 progeny from 39 AA sires and 32 Hereford sires resp. that were fed in 38 tests over a period of 28 yr. Estimates were obtained separately for each breed from a mixed-model analysis with tests considered as fixed effects, sires considered random, and the linear effects of initial age and the linear and quadratic effects of initial weight included as covariates. The hsuperscript 2 estimates for av. daily TDN intake, av. daily gain and the ratio gain/TDN intake were 0.18+or-0.06, 0.28+or-0.07 and 0.20+or-0.06 resp. for AAs, and 0.11+or-0.08, 0.19+or-0.09 and 0.36+or-0.10 for Herefords. Genetic correlations between av. daily TDN intake and av. daily gain were 0.84+or-0.09 and 0.50+or-0.41 for AAs and Herefords resp. Phenotypic and environmental correlations were also high and positive. Correlations with the ratio gain/TDN intake were higher for av. daily gain than for av. daily TDN intake.