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Genotype-Environment Interaction in Calf Production. II. Live Measurements and Carcass Traits

University of Guelph,¹ Guelph, Ontario, Canada

Abstract

THE experiment involved 48 pairs of male Holstein fraternal twin calves. Two methods of raising calves were contrasted: (A) High fat (20%) and protein (20%) vealer ration fed from 3 days of age to an average market weight of 129 kilograms. (B) The same vealer fed up to a live weight of 56.7 kg followed by a pelleted grain mixture fed ad libitum and hay offered to a maximum of 0.9 kg per day. Twin pairs were fed either uniformly on ration (A) or (B) or split; one twin being fed on each ration. The design provided a test of hypotheses on rations, pairs and ration x pair interaction effects. No evidence was found for significant ration x pair interaction for live measurements and most of the carcass traits except percent kidneys, percent fat in shoulder, kidneys and minor cuts and bone in flank and breast. The phenotypic correlations between five live measurements and carcass cut-out measurements of side weight, lean weight and percent, bone weight and percent, and fat weight and percent were also calculated.

¹ Department of Animal and Poultry Science.