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Two data sets were utilized to evaluate interaction between calf sex and calf genetic type for preweaning performance of calves varying in percentage (0, 50, 100) Brahman breeding. Data set I involved birth weight, preweaning average daily gain, and weaning weight records on 3562 Angus (AA), Brahman ♂ × Angus ♀ (BA) and Brahman (BB) calves; data set II consisted of birth weight, preweaning average daily gain and weaning weight records on 3752 Hereford (HH), Brahman ♂ × Hereford ♀ (BH) and Brahman (BB) calves. For both data sets, the calf sex × calf genetic type interaction was significant (P<0.01) except for preweaning average daily gain in data set II. In all cases, the significant interactions were represented by a change in magnitude rather than a change in rank for the two sexes of each calf genetic type. These results indicate that sex differences are expected to be much greater for Brahman-sired BA and BH calves than for calves of 0% (AA or HH) or 100% (BB) Brahman breeding. These increased sex differences are of greatest importance for birth weight because of the relationship that exists between birth weight and calving difficulty.
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