J. Anim Sci.
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Journal of Animal Science, Vol 72, Issue 10 2653-2660, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Biological availability of phosphorus in defluorinated phosphates with different phosphorus solubilities in neutral ammonium citrate for chicks and pigs

R. D. Coffey, K. W. Mooney, G. L. Cromwell and D. K. Aaron
Department of Animal Sciences, University of Kentucky, Lexington 40546.

Two experiments were conducted to assess the bioavailability of P in five sources of defluorinated phosphate (DFP) that differed in P solubility in neutral ammonium citrate (NAC). In Exp. 1, 384 2-d-old male chicks were fed a corn-cornstarch-dextrose-soybean meal basal diet (1.22% lysine, 1.00% Ca, .45% P) or the basal with .05 or .10% P from monosodium phosphate (MSP), or .10% P from DFP with 60, 70, 75, 82, or 91% NAC soluble P. Each diet was fed to six pen replicates of eight chicks per pen for 14 d (58 to 402 g). Growth rate, feed/gain, and tibia breaking strength and ash concentration were improved (P < .001) by P supplementation, regardless of P source. Tibia strength and ash were regressed on P intake, and slope-ratios were calculated to assess the relative bioavailability of P in the DFP sources. The bioavailabilities of P in the 60, 70, 75, 82, and 91% NAC soluble DFP sources, relative to MSP (given a value of 100), were 81, 75, 84, 84, and 91%, respectively (linear, P < .08). In Exp. 2, 35 individually penned pigs were fed a corn-soybean meal basal diet (.95% lysine, .75% Ca, .33% P) or the basal with .15% P from MSP or from the five DFP sources. Each diet was fed to five pigs for 33 d (15.0 to 35.9 kg). Growth rate, feed/gain, and breaking strength of the metacarpals, metatarsals, and femurs were improved (P < .001) by MSP and DFP.(ABSTRACT TRUNCATED AT 250 WORDS)


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C. N. Coon, S. Seo, and M. K. Manangi
The Determination of Retainable Phosphorus, Relative Biological Availability, and Relative Biological Value of Phosphorus Sources for Broilers
Poult. Sci., May 1, 2007; 86(5): 857 - 868.
[Abstract] [Full Text] [PDF]


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Copyright © 1994 by the American Society of Animal Science.