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

Authors :
Roberts, S. A.
Xin, H.
Kerr, B. J.
Russell, J. R.
Bregendahl, K.
Source :
Poultry Science. Aug2007, Vol. 86 Issue 8, p1625-1632. 8p. 4 Charts.
Publication Year :
2007

Abstract

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00325791
Volume :
86
Issue :
8
Database :
Academic Search Index
Journal :
Poultry Science
Publication Type :
Academic Journal
Accession number :
26111337
Full Text :
https://doi.org/10.1093/ps/86.8.1625