J. Anim Sci.
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J. Anim Sci. 1970. 30:1019-1022.
© 1970 American Society of Animal Science
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Comparative Energy Use in Bulls and Steers1

J. B. Bidart2, R. M. Koch and V. H. Arthaud

University of Nebraska, Lincoln

Abstract

Differences between bulls and steers in energy consumption associated with gain in edible product, carcass trim or average body weight were studied in 218 Angus males by multiple regression analysis. The partial regression in bulls of 6.0 Meal digestible energy (DE) per kilogram of gain in edible product was significantly less than the 20.3 Mcal DE per kilogram of gain in carcass trim. In steers the partial regressions were 12.8 Meal DE per kilogram of gain in edible product and 15.3 Mcal DE per kilogram gain of carcass trim. The partial regression of DE on average weight was 0.029 and 0.031 Meal DE per kilogram for bulls and steers, respectively. The standard partial regressions of DE on the independent variables for bulls and steers were 0.18 and 0.29 for edible product, 0.39 and 0.31 for carcass trim and 0.44 and 0.43 for average weight, respectively. DE consumed associated with gain in edible product (6.0 vs. 12.8 Mcal DE) or carcass trim (20.3 vs. 15.3 Mcal DE) was significantly different in bulls and steers, respectively, but maintenance requirements were similar.

Footnotes

1 Published with the approval of the Director as Paper No. 2682 Journal Series, Nebraska Agricultural Experiment Station. Contribution from North Central Regional Projects NC-1, Improvement of Beef Cattle Through Breeding Methods and NC-58, Beef Carcass Evaluation.

2 Present address: Estacion Experimental Agropecuaria, Balcarce, Argentina, S.A.






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