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A subset of birth weight records consisting of 191 535 calves, from 7021 herd-years with fewer than 50% estimated weights, tested during 1971 through 1980 was selected from the data files of the Federal-Provincial Record of Performance program for beef cattle to estimate breed averages and age of dam adjustment factors. The main effects included herd-years, breed of sire, breed of dam, sex of calf and age of dam. The interaction effects for breed of sire by sex of calf on birth weight were significant (P < 0.01) and the estimated differences for 22 breeds of sire expressed as deviations from the Hereford breed ranged from − 4.05 to 6.27 kg for male calves and from − 3.70 to 6.20 kg for female calves. The effects of breed of dam, sex of calf, age of dam and all the two-way interactions were significant at P < 0.01, while the three-way interaction was significant at P < 0.05. Additive age of dam adjustment factors within sex of calf were derived for 12 breeds of dam. The general age of dam effects averaged ...

BREED AVERAGES AND AGE OF DAM ADJUSTMENT FACTORS FOR BIRTH WEIGHT OF BEEF CATTLE