Abstract
The 18-month weights of 4703 Hereford (16 herds) and 10 226 Angus (33 herds) cattle, recorded over 8 years in the Beef Cattle Weight Gain Performance Recording Scheme, were analysed to estimate age and age-of-dam effects, and to evaluate present and alternative weight adjustment procedures. For least-squares analyses, 18-month weights were classified within breed and sex into herd, year-of-birth. and age-of-dam group effects, with age at weighing as a covariate. Separate analyses evaluated the importance of each first-order interaction among herd, year, and age-of-dam group effects. All main effects and the herd × year interaction were highly significant sources of variation (P < 0.001) and were considered to be of practical importance. The mean 18-month weight of Hereford males (females) was 496.9 ± 0.7 kg (356.7 ± 1.3 kg), and of Angus males (females) was 455.4 ± 1.0 kg (318.5 ± 1.4 kg). Corresponding linear regression coefficients of weight on age were 0.55 ± 0.02 kg/day (0.45 ± 0.02 kg/day) f...
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