Dietary strategies for reduced phosphorus excretion and improved water quality

R.O. Maguire, Z. Dou, J.T. Sims, J. Brake, B.C. Joern

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48 Citations (Scopus)


Received for publication October 29, 2004. 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.
Original languageEnglish
Pages (from-to)2093-2103
JournalJournal of Environmental Quality
Publication statusPublished - 2005
Externally publishedYes


  • trout oncorhynchus-mykiss
  • phytase supplementation
  • swine manure
  • dairy-cows
  • soluble phosphorus
  • broiler litter
  • poultry litter
  • amended soils
  • runoff losses
  • turkey diets

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