J. Anim Sci.
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J. Anim Sci. 1972. 34:146-151.
© 1972 American Society of Animal Science
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Level of Peanut Hulls as a Roughage Source in Beef Cattle Finishing Diets1

P. R. Utley and W. C. McCormick2

Coastal Plain Experiment Station, Tifton 31794

Abstract

Sixty-eight yearling steers were fed for 84 days in two trials to compare the feedlot performance and volatile fatty acid production when fed from 0 to 30% peanut hulls as a component of finishing diets. Apparent digestibility and nitrogen balance were determined on the all-concentrate diet compared to diets containing 10, 20 or 30% peanut hulls. When unshrunk final weights were used for calculations, average daily gain was less (P<.10) in a linear trend (P<.05) for steers fed all-concentrate compared with steers fed diets containing 20 to 30% peanut hulls. Adjustment of body weight gain to a constant body fill by covariate analysis resulted in a quadratic relationship (P<.10) for average daily gain and level of peanut hulls in the diet. In both trials, consumption of the diets increased proportionately to the level of hulls in the diet. This resulted in a similar concentrate intake for all treatments. The molar percent concentration of acetate increased and propionate decreased with an increase in level of hulls fed. In general, isovalerate increased and valerate decreased when high levels of peanut hulls were fed. The all-concentrate diet exceeded (P<.05) the 20 and 30% hull diets in dry matter digestibility and exceeded (P<.05) all diets containing peanut hulls in crude fiber digestibility.

Footnotes

1 Journal Series Paper No. 1082, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton.

2 Department of Animal Science.






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Copyright © 1972 by the American Society of Animal Science.