Effect of Phytase and Vitamin D Metabolite in Poultry Diets on Phosphorus in Broiler Litter, Litter Amended Soils, and Runoff. (S11-mcgrath140757-oral)
Authors:
J.M. McGrath* - Univ. of Delaware J.T. Sims - Univ. of Delaware R.O. Maguire - Univ. of Delaware W.W. Saylor - Univ. of Delaware C.R. Angel - Univ. of Maryland
Abstract:
Broiler diet modification using additives such as phytase and vitamin D metabolites in conjunction with reductions in non-phytate phosphorus (NPP) may provide a viable means to reduce phosphorus (P) concentrations in broiler litter (BL). However, little is known about the effect of dietary modification on P solubility in BL or litter-amended soil. A field study was conducted to determine the impact of phytase and vitamin D metabolite addition to broiler diets on P solubility and forms in BL and litter amended soils and how this in turn would influence P losses in runoff from amended soils. The five diets used in the field study included a high NPP diet with and without phytase, a low NPP diet with and without phytase, and a low NPP diet with phytase and vitamin D. Three locations were selected for the field study and water soluble P was monitored over the course of one year and two runoff studies were conducted using a rainfall simulator and soil collected from two of the field sites. The impact of diet P solubility in BL, litter amended soil, and runoff will be discussed.
Speaker Information: Joshua McGrath, Univ. of Delaware, 152 Townsend Hall, Newark, DE 19977;
Phone: 302.831.1286; E-mail: [email protected]
Session Information: Wednesday, November 5, 2003, 1:25 PM-2:45 PM Presentation Start: 1:25 PM
Keywords: Phosphorus Solubility; Broiler Diet; Phytase; Vitamin D
