Abstract
Abstract Fifty-four Angus heifers born and raised at 3 origins—namely, ‘Tuapaka’ farm, Massey University (MU), 22 animals; Central Hawke's Bay (HB), 20 animals; and Wairarapa (W), 12 animals—were mated as one mob at 2 years of age to an Angus bull in October 1974. On 1 May 1975, the HB heifers were significantly heavier (405.7 ± 5.3 kg; P < 0.01) than MU (368.5 ± 5.1 kg) and W heifers (370.4 ± 7.2 kg). All groups of heifers maintained their 1 May liveweight until calving in August. Liveweight differences resulting from the influence of environment during rearing of the heifers to 2 years of age are discussed. By the second calving, at 4 years of age, there was no significant difference in liveweight between heifers of different origin. In 1975, calves born to HB heifers were heavier (27.9 ± 0.7 kg) than those born to MU and W heifers by 1.3 kg (NS) and 2.9 kg (P<0.10) respectively. There was no significant effect of origin of dam on calf birth weight at second calving in 1976. At weaning, the first crop o...
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