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Effects of Liquid Fraction Pressed from Dairy Cattle Excreta (LE) in Lamb Diets

United States Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705

Abstract

Liquid was separated from fresh dairy cattle excreta (LE) by the use of a screw press. LE (8% Dry matter) that contained 95% neutraldetergent solubles dried on corn cobs replaced 0, 2.8, or 6% units of the dry matter of 40% corn cob diets. The remainder of the dry matter of the three diets consisted of 40% corn meal, 6.4% soybean meal, 2.5% alfalfa meal, .5% salt, and .6% dicalcium phosphate. The three pelleted complete diets were fed ad libitum in four growth trials with 18 lambs (initial weight 28.1 kg) in each trial. Digestibility and nitrogen balance were conducted at the end of each growth trial with three lambs from each treatment. The two levels of LE did not affect nutrient digestibilities (P>.05), and means were: dry matter, 59%; organic matter, 60%; cell walls, 40%; and nitrogen, 56%. Daily nitrogen retention averaged 3.8 g and did not differ (P>.05) as a result of added levels of LE. Lamb performance did not differ (P>.05) as a result of LE in diets, and means were: daily dry matter intake, 1.31 kg; average daily gain, 229 g; digestible organic matter for growth, 343 g; and partial conversion of digestible organic matter to gain, 1.55 kg/kg. Efficiency of nutrient utilization for growth by lambs was neither adversely affected nor stimulated by these levels of dietary additions of LE.

¹ Animal Physiology and Genetics Institute, Feed Energy Conservation Laboratory.

² The authors acknowledge D. E. Miller for conducting these trials, E. F. Bierman for conducting the chemical analyses, and B. T. Weinland, Biometrical Services Staff, for conducting the statistical analyses.