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Effect of Processing Method of Broiler Litter on Nitrogen Utilization by Lambs^{1, 2,}

Virginia Polytechnic Institute and State University⁴, Blacksburg 24061

Abstract

An experiment was conducted to determine the amount of 1 N sulfuric acid required to lower the pH of broiler litter from an initial pH of about 8 to a final pH of about 6, and to evaluate the effect of acidification of litter on nitrogen loss from dry heat. Approximately 30 ml of 1 N acid were required per 100 g of litter. Nitrogen loss during heat treatment (4 hr. at 150 C) was reduced about 50% when litter was acidified to a pH of 6 prior to heating.

Two metabolism trials were conducted to study the effects of different methods of processing broiler litter on digestibility and nitrogen utilization by lambs. The isonitrogenous rations differed in the source of supplemental nitrogen. Autoclaved litter, dry heat litter, acid plus dry heat litter and soybean meal supplied equal amounts of nitrogen in four respective rations. Supplementary nitrogen sources were estimated to supply 50% of the total dietary nitrogen.

¹ Broiler litter was supplied by Rocco Feeds, Inc., Harrisonburg, Va.

² Supported in part by Public Health Service Grant No. EC-00034.

³ Present address: Department of Agricultural Chemistry, University of Missouri, Columbia 65201.

⁴ Department of Animal Science.