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Relationship between Preweaning Nutritional Management and Subsequent Performance of Angus and Hereford Females through Three Calf Crops^{1, 2,}

Oklahoma State University, Stillwater 74074³

Abstract

A Total of 206 Angus and Hereford females in four trials conducted under range conditions were studied under three nutritional management systems imposed by weaning at 140 days, weaning at 240 days, and creep-feeding followed by weaning at 240 days. At completion of treatments at 240 days of age, weights (kg) of the respective treatment groups were 182.1, 221.0 and 234.0 for Angus and 169.2, 202.0 and 217.9 for Herefords. The females, bred to calve first at 2 years of age, were allowed to produce calves through 4 years of age.

Birth weight of first calves was heaviest (P<.05) from creep-fed females. Although differences were not statistically significant (P>.05), creep-fed females weaned the lightest calves in each of the three calf crops; their calves had the lowest condition scores (P<.10 and .005) in calf crops 1 and 3. Milk yield also tended to be lowest for creep-fed females, and highest for 240-day weaned females. None of eight additional estimates of size of the progeny at 140 days of age was consistently influenced by preweaning nutritional management of the dam.

¹ Published as Journal Article 2538 of the Oklahoma Agricultural Experiment Station, Stillwater 74074.

² The assistance of J. V. Whiteman in statistical analysis and R. D. Morrison in statistical analysis and computer programming is gratefully acknowledged.

³ Department of Animal Sciences and Industry.