Reprinted, with permission, from the proceedings of: Mitigating Air Emissions From Animal Feeding Operations Conference.
Ammonia (NH3) generation from poultry production is a result of microbial decomposition of uric acid and undigested nitrogen in bird feces. Ammonia emission is associated with nitrogen (N) content of the feces, which is influenced by feed composition and feed conversion efficiency of the bird. To reduce N content in feces, ration may be formulated with reduced dietary crude protein (CP) and supplemented with limiting amino acids (AA) to match bird dietary requirements, thereby improving digestive conversion efficiency. Utilization of lower CP diets with supplemented essential amino acids is a source reduction method to mitigate ammonia emission from layer hen production facilities. Lower N excretion in the bird feces due to lower total N intake can result in lower NH3 emission from the system. The lower CP diet used in this study had 0.4 to 1.2% less CP than the standard or control diet during various feeding phases. The lower CP diet resulted in about 10% ammonia emission reduction. Formulation based on nutritional requirement at different feeding phases is required to achieve emission reduction without affecting bird performance, i.e. egg production and case weight. The cost of low CP diet is about 1% lower than that of the standard dietary formulation (2008 prices).
The cost for the lower CP diet with supplemented crystalline AA DL-methionine, L-lysine.HCL and L-threonine is about 1% lower than that for the standard diet. The cost advantage is better now with the current higher grain costs than in year 2003 when the study was conducted.
Y. Liang1, H. Xin2, R.S. Gates3, E.F. Wheeler4, K.D. Casey5, B.R.Behrends6, D.J.Burnham7
1University of Arkansas, Fayetteville, AR, 2Iowa State University,Ames, IA, 3University of Kentucky, Lexington, KY, 4Pennsylvania State University, University Park, PA, 5Texas AgriLife Research, Amarillo, TX, 6Agri-Tech, a Sparboe Company, Litchfield, MN, 7Aviagen, Huntsville, AL
Point of Contact:
Hongwei Xin, email@example.com
The information provided here was developed for the conference Mitigating Air Emissions From Animal Feeding Operations Conference held in May 2008. To obtain updates, readers are encouraged to contact the author.