Summary and Implications
The Environmental Protection Agency (EPA) has enacted regulations that will restrict the amount of phosphorus (P) that can be applied to land. With the vast majority of swine production sites operating at high stocking densities and having less available land on which to apply animal effluent, increased P levels in manure could substantially increase production costs.
Iowa State University
Qu, A.; Hittmeier, L.; Grapes, Laura; Rothschild, Max F.; and Stahl, Chad H.
"Genetic Pathways to Environmentally Friendly Pigs,"
Animal Industry Report:
AS 651, ASL R2026.
Available at: http://lib.dr.iastate.edu/ans_air/vol651/iss1/13