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Ammonium Polyphosphate as a Source of Phosphorus and Nonprotein Nitrogen for Monogastrics¹

North Carolina State University, Raleigh 27650

Abstract

Ammonium polyphosphate (APP) was substituted for 0, 50 and 100% of the P supplied by defluorinated rock phosphate (DRP) in corn-soybean meal diets for growing rats and growing-finishing (G-F) pigs. The diets were formulated to contain 10% protein, .75% Ca and .60% P. Two-thirds of the P in the control diet was supplied by DRP. Replacement of 50 or 100% of the DRP with APP increased the dietary N by 7.25 and 14.5%, respectively. To evaluate nonprotein N (NPN) utilization, we used ammonium chloride (NH₄CI) to provide a level of N equivalent to that supplied by APP when it replaced 100% of the P supplied by DRP. These four treatments were repeated with supplementation of limiting amino acids (L-lysine, L-tryptophan and DL-metliionine. Daily feed intake, rate of gain and feed:gain (F:G) of rats and G-F pigs were not influenced (P>.05) by the substitution of APP for DRP as a P source in corn-soybean meal diets witli or without supplemental amino acids. F:G was improved (P<.05) by the addition of limiting amino acids to diets for pigs, and a similar trend occurred in rats. The addition of NH₄C1 to the 10% protein diets as a source of NPN resulted in no observable benefit for growing rats or G-F pigs. Percentages of ham and loin, percentages of bone ash and P content of the bone ash in pigs were not influenced by the dietary treatments.

¹ Paper No. 5648 of the Journal Ser. of die Nordi Carolina Agr. Exp. Sta., Raleigh. The use of trade names in this publication does not imply endorsement by the North Carolina Agr. Exp. Sta. of the products named, nor criticism of similar ones not mentioned.

² Anim. Sci. Dept