J. Anim Sci.
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J. Anim Sci. 1974. 38:442-448.
© 1974 American Society of Animal Science
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Winter Supplementation of Beef Calves on Sandhill Range1

G. H. Scales2, A. H. Denham3, C. L. Streeter4 and G. M. Ward5

Colorado Agricultural Experiment Station, Fort Collins 80521

Abstract

Winter supplementation trials were conducted with 63 individually fed weaner calves on sandhill range from December 1, 1971 to February 28, 1972. Calves supplemented with 604 g soybean daily (2 Mcal DE/250 g crude protein) were 41 kg heavier (P <.05) than unsupplemented calves at the cessation of the feeding period in late February. However, supplementation of 510 g corn (2 Mcal DE/50 g CP) failed to significantly (P >.05) increase live weight gains. Increments of digestible energy with crude protein consumption restricted to 250 g failed to increase live weight gains. When crude protein levels were increased to 500 g, additional energy significantly (P <.05) increased live weight gains. High energy-protein (6 Mcal DE/500 g CP) supplemented animals gained 0.72 kg per day and by February were 68 kg heavier than unsupplemented controls. Compensatory growth in the unsupplemented and energy (510 g corn) treatments during the three months subsequent to the feeding period failed to eliminate these live weight differences.

Forage dry matter consumption calculated from fecal excretion and indigestibility ratios was approximately 44 g/kg W0.75 and represented approximately 2.0% of live weight for most treatments. Forage consumption was generally depressed by supplementation, although the depression did not occur with energy supplemented (510 g corn) animals. Possible reasons are discussed.

Footnotes

1 Supported by the Colorado State University Experiment Station and published as Scientific Series Paper No. 1843.

2 Present address: Tara Hills High Country Research Station, Kurow, New Zealand.

3 Eastern Colorado Range Station, Akron, Colorado.

4 Buffalo Gap, South Dakota.

5 Department of Animal Sciences, Colorado State University, Fort Collins.






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Copyright © 1974 by the American Society of Animal Science.