Journal or Book Title
Research Focus Area(s)
Animal Production Systems Engineering
Ammonia (NH3 ) emission is a major concern for the poultry industry. The objective of this research was to determine whether inclusion of dietary ﬁber and a reduced dietary CP content would decrease NH3 emission from laying-hen manure. A total of 256 Hy-Line W-36 hens were fed diets with 2 levels of CP (normal and reduced) and 4 ﬁber treatments in a 2 × 4 factorial arrangement. The ﬁber treatments included a corn and soybean meal-based control diet and diets formulated with either 10.0% corn dried distillers grains with solubles (DDGS), 7.3% wheat middlings (WM), or 4.8% soybean hulls (SH) to contribute equal amounts of additional neutral detergent ﬁber. The CP contents of the reduced-CP diets were approximately 1 percentage unit lower than those of the normal-CP diets. All diets were formulated on the basis of digestible amino acid content and were formulated to be isoenergetic. Fresh manure was collected such that pH, uric acid, and Kjeldahl N contents could be measured. The NH3 emission from manure was measured over 7 d by placing pooled 24-h manure samples in NH3 emission vessels. Data were analyzed by ANOVA with Dunnett’s multiple-comparisons procedure to compare results from the ﬁber treatments with the control, whereas the main effect of protein was used to compare the normal- and reduced-CP treatments. Dietary corn DDGS, WM, or SH lowered (P ≤ 0.01) the 7-d cumulative manure NH3 emission from 3.9 g/kg of DM manure for the control to 1.9, 2.1, and 2.3 g/kg of DM manure, respectively, and lowered (P < 0.05) the daily NH3 emission rate. Results of this study showed that dietary inclusion of 10.0% corn DDGS, 7.3% WM, or 4.8% SH lowered NH3 emission from laying-hen manure; however, reducing the CP content by 1 percentage unit had no measurable effect on NH3 emission.
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Roberts, Stacey Ann; Xin, Hongwei; Kerr, Brian J.; Russell, James R.; and Bregendahl, Kristjan, "Effects of Dietary Fiber and Reduced Crude Protein on Ammonia Emission from Laying-Hen Manure" (2007). Agricultural and Biosystems Engineering Publications. 212.