Use of embryo transfer to produce twinning in beef cattle: Postweaning performance of Calves

Abstract

Thirty-five purebred Angus calves, including six fraternal twin sets produced via embryo transfer, were fed during postweaning performance tests approximately 140 days in length. Singles had greater ( P < 0.01) on-test weights than twins, reflecting their heavier weaning weights. Postweaning gains of singles and twins were similar ( P=0.41). Twins were 13% lighter ( P=0.04) than singles at 365 days of age and had 3.5% smaller ( P=0.13) off-test hip heights. However, these differences were eliminated by adjustment for on-test weight. Off-test backfat thickness was not affected ( P=0.43) by type of rearing. Scrotal circumference of single and twin bull calves at the conclusion of the postweaning test did not differ ( P=0.58). Results indicate that calves raised as twins have acceptable postweaning performance.