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What Aspect of Dietary Modification in Broilers Controls Litter Water-Soluble Phosphorus

Dietary Phosphorus, Phytase, or Calcium?

^a USDA-ARS, Northwest Irrigation and Soils Research Lab., 3793 N. 3600 E., Kimberly, ID 83341-5076, USA
^b Dep. of Poultry Science, College of Agriculture and Life Sciences, Campus Box 7608, North Carolina State Univ., Raleigh, NC 27695-7608
^c Crop and Soil Environmental Sciences Dep. (0404), Virginia Tech, Blacksburg, VA 24061
^d USDA-ARS, Soybean and Nitrogen Fixation Research Unit, 3127 Ligon St., Raleigh, NC 27607

View larger version (13K): [in this window] [in a new window]   Fig. 1. The comparison of proportion of phytate P to total phosphorus in litters analyzed by high performance liquid chromatography (HPLC) and 31P nuclear magnetic resonance (NMR) spectroscopy. Dashed lines represent the 95% confidence intervals.

View larger version (13K): [in this window] [in a new window]   Fig. 2. The effect of dietary available phosphorus on litter total phosphorus concentrations for both non-phytase and phytase-amended diets.

View larger version (11K): [in this window] [in a new window]   Fig. 3. The relationship between litter phytate phosphorus concentration and litter total phosphorus concentration for all diets.

View larger version (12K): [in this window] [in a new window]   Fig. 4. The influence of dietary calcium to available phosphorus ratio on the litter water-soluble phosphorus concentration of both non-phytase and phytase-amended diets.

View larger version (14K): [in this window] [in a new window]   Fig. 5. The influence of dietary calcium to available phosphorus ratio on the litter water-soluble phosphorus to total phosphorus ratio of both non-phytase and phytase-amended diets.

View larger version (12K): [in this window] [in a new window]   Fig. 6. The relationship between litter phytate phosphorus to total phosphorus ratio and litter water-soluble phosphorus for both non-phytase and phytase-amended diets.

View larger version (11K): [in this window] [in a new window]   Fig. 7. The relationship between dietary calcium to available phosphorus ratio and the fraction of inorganic phosphorus (IP) in litter (determined by 31P nuclear magnetic resonance [NMR] spectroscopy) that was water-soluble.