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An experiment was conducted to determine the minimum levels of nonphytate P (NPP) with and without phytase that can be continuously and safely used during the growing and laying periods for diminishing P excretion to the environment. The experiment consisted of a 2 × 8 factorial arrangement of the treatments with two strains (Babcock B-300 and Hy-Line W-98) and eight diets. The birds of the control group (T 1 ) were fed a determined NPP regimen of 0.34-0.30-0.23% for the periods of 0 to 6 wkdoi:10.1093/ps/82.9.1444 pmid:12967259 fatcat:rg6pynbl5ja2dkrmx3xbrbo6zq