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Effects of Dietary Fiber and Reduced Crude Protein on Ammonia Emission from Laying-Hen Manure¹

S. A. Roberts^*, H. Xin, B. J. Kerr, J. R. Russell^* and K. Bregendahl^*,2

^* Department of Animal Science, and Department of Agricultural and Biosystems Engineering, Iowa State University, Ames 50011; and Swine Odor and Manure Management Research Unit, Agricultural Research Service, USDA, Ames, IA 50011

² Corresponding author: kristjan{at}iastate.edu

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 x 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.

Key Words: ammonia emission • corn dried distillers grains with solubles • reduced-protein diet • soybean hull • wheat middlings

¹ Mention of trade names, proprietary products, or specific equipment does not constitute a guarantee or warranty by Iowa State University or the USDA and does not imply approval to the exclusion of other products that may be suitable.

This article has been cited by other articles:

				S. A. Roberts, H. Xin, B. J. Kerr, J. R. Russell, and K. Bregendahl Effects of Dietary Fiber and Reduced Crude Protein on Nitrogen Balance and Egg Production in Laying Hens Poult. Sci., August 1, 2007; 86(8): 1716 - 1725. [Abstract] [Full Text] [PDF]