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Effect of Roughage Fraction of Cattle Manure on Digestibility and Net Energy of Feedlot Diets Fed Steers¹

University of Florida, Gainesville 32611³

Abstract

Diets containing 0, 20, 40 or 60% (wet weight basis) of a processed manure roughage obtained from a commercial feedlot were evaluated with steers for digestibility, net energy, feedlot performance, carcass characteristics and mineral accumulation in tissues. The manure roughage stimulated feed intake and body weight gains even though it depressed metabolizable energy (ME) and TDN of the diets. Steers offered ad libitum 0, 20, 40 and 60% manure roughage diets over 124 days gained 1.10, 1.53, 1.58 and 1.51 kg per day, respectively. The NE_m requirement of the steers was determined to be 78 kcal per W-⁷_kg Net energy for gain was not depressed in diets with increasing levels of manure roughage. Dressing percentage, USDA carcass grade, maturity, marbling, flavor, juiciness, tenderness and overall acceptance of the steaks were not effected by the manure roughage. There were no toxic levels or accumulation of Hg, Pb, Cd, Ni, Cu, or Fe in any of the diets or tissues (muscle, liver, kidney).

¹ Published by the Univ. of Florida Agr. Exp. Sta., Gainesville, as Journal Article No. 1607.

² Present address: Agr. Research Center, Ona, FL 33865.

³ Dept. of Animal Science.