J. Anim Sci.
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J. Anim Sci. 1983. 57:632-637.
© 1983 American Society of Animal Science
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Ammonium Polyphosphate versus Dicalcium Phosphate as a Phosphorus Supplement for Growing-Finishing Swine1

D. L. Tunmire, D. E. Orr, Jr. and L. F. Tribble

Texas Tech University2, Lubbock 79409

Abstract

A total of 160 crossbred pigs were fed a sorghum-soybean meal diet with ammonium polyphosphate (APP) or dicalcium phosphate (DiCa) as supplemental phosphorus (P) sources for growing-finishing swine. The diets contained P levels of .5 and .4% for the grower phase and .4 and .33% for the finisher phase. Ammonium polyphosphate was evaluated on the basis of pig performance and bone development and compared with DiCa as a standard. The first rib and third and fourth metacarpals were removed from eight barrows from each of the four treatments. Replacement of DiCa with APP as the P supplement did not affect (P>.05) average daily gain, average daily feed and feed:gain ratio of growing-finishing pigs. No effect on bone variables examined on the first rib and third and fourth metacarpals was obtained between pigs fed APP or DiCa. Pigs on the lower supplemental P levels had lower (P<.05) dry fat-free weight and percentage ash for all three bones. The breaking force of the first rib was less (P<.05) for the pigs fed the lower P supplements of APP and DiCa than for pigs fed the higher level of DiCa. A trend was observed for an apparent decreased P availability from APP than DiCa when fed at the lower level of supplementation, but this trend was not observed when APP was added to provide a P level to meet National Research Council requirements. Ammonium polyphosphate as a P supplement for growing-finishing swine was satisfactory for performance and bone mineralization as compared with DiCa.

Footnotes

1 Approved by the Dean of the College Agr. Sci. Pub. No. T-5-166.

2 Dept. of Anim. Sci.






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Copyright © 1983 by the American Society of Animal Science.