The influence of breed of sire on birth size of calves was determined from measurements on 687 calves from Holstein dams. Ten Holsteins sired 491 (H-H) calves that averaged 93 lb, 30.8 in. heart girth, and 5.1 in. maxinmm width of head. Four Angus sired 196 (A-H) calves with comparable averages of 79 lb, 29.3 in., and 5.0 in., respectively. Analysis of covariance, adjusting size of calf for size of dam, revealed that H-H calves were significantly larger in body weight, heart girth, and head width than calves sired by Angus bulls (P < 0.01). Two Holstein bulls sired significantly larger calves than the eight other Holsteins and one Angus bull sired significantly smaller calves than the three other Angus.
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Boyd et al. (1965) studied this question.
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