Efficient Feed Nutrient Utilization to Reduce Pollutants in Poultry and Swine Manure

TLDR: In this article, the authors showed that the addition of synthetic amino acids and reducing protein contents resulted in significant decreases in the N, P, odor, and dry matter (DM) weight of manure.

Abstract: High-density livestock facilities lead to a concentration of livestock wastes and subsequent leakage of pollutants into the environment, resulting in public concern about their effects. Nitrogen (N) and phosphorus (P) are the most harmful components of animal manure, but odor from the manure itself and the livestock facilities is also a problem. Improving the nutrient efficiency of the livestock helps to decrease excretion of these environmental contaminants. Pigs and chickens are the main animals used in studies to improve nutrient efficiency to reduce excretion of environmental contaminants. Addition of feed supplements and modifying feeding programs to improve nutrient efficiency can result in significant decreases in the N, P, odor, and dry matter (DM) weight of manure. Examples of these methods include the following. (1) The addition of synthetic amino acids and reducing protein contents resulted in N reductions of 10 to 27% in broilers, 18 to 35% in chicks and layers, 19 to 62% in pigs, and a 9 to 4...