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Puberty in Crossbred and Straightbred Beef Heifers on two Levels of Feed¹

U.S. Department of Agriculture, Fort Robinson Beef Research Station, Nebraska and University of Nebraska, Lincoln

Abstract

Age and weight at puberty in heifers were determined for Hereford, Angus and the crosses between the two breeds. The heifers were allotted to two nutritional levels from weaning to puberty. The average daily gain from 6 to 12 months of age was 0.82 kg. and 0.73 kg. for crossbred and straightbred heifers on the high level of feed and 0.30 kg. and 0.36 kg. for crossbred and straightbred heifers on the low level of feed. The average age at puberty was 381 days for both crossbred and straightbred heifers on the high level of feed, while on the low level of feed the average age at puberty was 424 days for the crossbred heifers and 572 days for the straightbred heifers. The average weight at puberty was 330 kg. for crossbred heifers and 299 kg. for straightbred heifers on the high level of feed and 254 kg. and 268 kg. for crossbred and straightbred heifers on the low level of feed. Thus, an interaction for age and weight at puberty was found between level of nutrition and breed of the heifer.

¹ Published with the approval of the director as Paper No. 2375 Journal series, Nebraska Agriculture Experiment Station.

² Present address: Department of Animal Science, Colorado State University, Fort Collins.

³ Present address: The Upjohn Co., Kalamazoo, Michigan.

⁴ Deceased.

⁵ Authors wish to acknowledge the assistance of J. W. Thornton in the analysis of the data.

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