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Evaluation of the Phosphorus Provided by Animal Proteins in the Diet of Broiler Chickens

Poultry Science Department, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-2065; FAX: (501) 575-3474

Correspondence: P. W. Waldroup

This study attempted to determine the biological availability of phosphorus in a chick feeding trial. Researchers compared the phosphorus in six samples of poultry byproduct meal and eleven samples of meat and bone meal to a feed-grade mono-dicalcium phosphate. The samples were analyzed to determine moisture, crude protein, fat, ash, crude fiber, calcium, phosphorus, and amino acid content; metabolizable energy was calculated from proximate composition. Diets had adequate but not excessive amounts of all essential nutrients. "Summit" diets containing 0.447% nonphytate phosphorus (NPP) used each of the animal protein sources or the mono-dicalcium phosphorus as the sole source of supplemental phosphorus; these were then blended with a low-phosphorus (0.12% NPP) basal to provide a range on NPP levels. These data indicate no significant difference in relative biological availability of phosphorus in any of the animal protein sources vs. the feed grade mono-dicalcium phosphorus.

Key Words: Animal proteins • availability • bone ash • phosphorus