Study 1 involved records on 10 603 purebred and crossbred calves sired by American Angus and Hereford bulls in 7 US States. For birth weight and weaning weight, the breed of sire × location and calf breed type × location interactions were significant. Hereford-sired calves were heavier at birth (by 2.3 kg) than Angus-sired calves in the 7 States, but the magnitude of the differences varied among States. For weaning weight, Hereford-sired calves were heavier in Alabama, Florida and Louisiana, lighter in Arkansas, North Carolina and Virginia, and similar to Angus-sired calves in Kentucky. When averaged across the locations, weaning weights were similar for the 2 sire groups. The calf breed type × location interaction indicated that crossbred calves were heavier at birth (by 1.3 kg) and weaning (15 kg) than purebred calves but the magnitude of the differences varied among locations. Study 2 involved records on 3966 purebred and crossbred calves sired by Brahman, Angus and Hereford bulls in 2 States. For birth weight and weaning weight, the breed of sire × location interactions were significant; the calf breed type × location interaction was significant only for weaning weight. There was a tendency for the 3 sire breeds to change in rank with respect to birth weight between the 2 locations, but this was not the case for weaning weight. The calf breed type × location interaction indicated that crossbred calves were heavier at weaning than purebred calves, but the magnitude of their superiority differed between the 2 States.
Study 1 involved records on 10 603 purebred and crossbred calves sired by American Angus and Hereford bulls in 7 US States. For birth weight and weaning weight, the breed of sire × location and calf breed type × location interactions were significant. Hereford-sired calves were heavier at birth (by 2.3 kg) than Angus-sired calves in the 7 States, but the magnitude of the differences varied among States. For weaning weight, Hereford-sired calves were heavier in Alabama, Florida and Louisiana, lighter in Arkansas, North Carolina and Virginia, and similar to Angus-sired calves in Kentucky. When averaged across the locations, weaning weights were similar for the 2 sire groups. The calf breed type × location interaction indicated that crossbred calves were heavier at birth (by 1.3 kg) and weaning (15 kg) than purebred calves but the magnitude of the differences varied among locations. Study 2 involved records on 3966 purebred and crossbred calves sired by Brahman, Angus and Hereford bulls in 2 States. For birth weight and weaning weight, the breed of sire × location interactions were significant; the calf breed type × location interaction was significant only for weaning weight. There was a tendency for the 3 sire breeds to change in rank with respect to birth weight between the 2 locations, but this was not the case for weaning weight. The calf breed type × location interaction indicated that crossbred calves were heavier at weaning than purebred calves, but the magnitude of their superiority differed between the 2 States.
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