From body weight, food intake and carcass composition data on 447 Hereford bull calves, measured from 200 to 400 days, several traits relating to the efficiency of beef cattle production were derived and analysed. Traits included body weight at various ages, weight gain, estimated lean carcass content, lean growth rate, food intake, food conversion ratio, lean food conversion ratio, food intake in relation to metabolic body weight, energy required for protein and fat accretion, and maintenance requirements. Traits combining carcass composition and body weight were moderately to strongly inherited whereas traits combining food intake and body weight were weakly inherited, as was maintenance. Energy required to accrete protein and fat was strongly related to weight gain. Contrary to expectation, maintenance showed no general relationship with carcass lean content.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 263–266, 1990
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