Dietary Strategies for Reduced Phosphorus Excretion and Improved Water Quality
- R. O. Maguire *a,
- Z. Doub,
- J. T. Simsc,
- J. Brakea and
- B. C. Joernd
- a Department of Poultry Science, North Carolina State University, Raleigh, NC 27695
b School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348
c Department of Plant and Soil Science, University of Delaware, Newark, DE 19716
d Department of Agronomy, Purdue University, West Lafayette, IN 47907
Cost effective feeding strategies are essential to deal with P surpluses associated with intensive animal agriculture and the consequent impact on water quality. Reduction of P overfeeding, use of feed additives to enhance dietary P utilization, and development of high available phosphorus (HAP) grains have all been shown to decrease fecal P excretion without impairing animal performance. Much progress has been made, but more research will be needed to refine these strategies to maximize reductions in P excretion while maintaining animal performance. Recent research has focused on the impact of modifying dietary P on the forms of P excreted and the mobility of P in soils amended with these manures, with strong treatment trends becoming evident in the literature. In general, dietary strategies have been developed that can effectively reduce the total P concentration in manures produced, and combining strategies usually leads to greater reductions than individual practices. However, the impact of different approaches on the solubility of P in manures and amended soils has been more variable. Soluble P remains of particular concern due to links between solubility of P in manure and P losses from manure-amended soils. In this paper, we outline the major strategies for reducing dietary P in different species, review the literature on the impact of these approaches on P forms in manures and amended soils, and discuss the potential beneficial effects on animal agriculture and the environment.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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