Abstract
ABSTRACT Phosphorus (P) in manure is a nutrient source for plants, but surplus P amended to fields represents a risk to the environment. This study examines the interactions between low‐P diets for pigs and dairy cows and the separation of animal slurry into a solid P fraction and a liquid fraction. Replacing inorganic phosphates with phytase in pig feed reduced the concentration of P in slurry by 35%, but supplementing concentrates to dairy cows did not affect the P concentration in cattle slurry. Particle‐size fractions of the slurry were not affected by these dietary changes. The amount of dry matter (DM) in the <0.025 mm fraction was greater in pig slurry than in cattle slurry, but the relative amounts of P and nitrogen (N) were larger in the >0.025 mm fraction. Replacing feed phosphate, in the form of mono‐calcium phosphate, with phytase in the pig diet reduced the separation index (efficiency) of P from 80% to 60%.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
