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Influence of Phytase Addition to Poultry Diets on Phosphorus Forms and Solubility in Litters and Amended Soils

^a Department of Soil Science, North Carolina State University, Raleigh, NC 27695
^b Department of Plant and Soil Science, University of Delaware, Newark, DE 19716
^c Department of Animal and Food Science, University of Delaware, Newark, DE 19716
^d Soil and Water Science Department, University of Florida, Gainesville, FL 32611
^e Department of Animal and Avian Science, University of Maryland, College Park, MD 20742
^f Department of Animal Sciences, Purdue University, West Lafayette, IN 47907

View larger version (16K): [in a new window]   Fig. 1. Representative solution 31P nuclear magnetic resonance (NMR) spectra of broiler and turkey litter. The signal at approximately 6.1 ppm is orthophosphate, while the four other strong signals in the ratio 1:2:2:1 represent phytic acid. Both samples contained the greatest proportions of phytic acid for that manure type (Broiler 2 = 61%, Turkey B = 39%).

View larger version (43K): [in a new window]   Fig. 2. Sequential chemical fractionation of P forms in selected turkey and broiler litters. Selected litters include those from high and low non-phytate phosphorus (NPP) diets, and equivalent diets with and without phytase. Means followed by different letters are significantly different at the 0.05 probability level. The legend defines litters considered high and low in dietary NPP, with and without phytase as defined in Table 1.

View larger version (44K): [in a new window]   Fig. 3. Total litter ortho P and phytate P concentrations in selected litters, identified by solution 31P nuclear magnetic resonance spectrometry (NMR). The legend defines litters considered high and low in dietary non-phytate phosphorus (NPP), with and without phytase as defined in Table 1.

View larger version (37K): [in a new window]   Fig. 4. Water-soluble phosphorus (WSP) in unamended control soils and soils amended with selected litters: (a) turkey litters at 5 d, (b) broiler litters at 5 d, (c) turkey litters at 29 d, and (d) broiler litters at 29 d. Means followed by different letters are significantly different at the 0.05 probability level. The legend defines soils amended with litters considered high and low in dietary non-phytate phosphorus (NPP), with and without phytase as defined in Table 1.

View larger version (30K): [in a new window]   Fig. 5. Comparison of the increase in water-soluble phosphorus (WSP) in soils to WSP added in litters, at time periods after litter amendment of (a) 5 d and (b) 29 d. The symbols * and ** denote significant regressions at the 0.05 and 0.01 probability levels, respectively.