The apparent digestibility of phytate phosphorus and the influence of supplemental phytase in horses

Journal of Animal Science
D A van DoornA C Beynen

Abstract

Availability of phytate-bound P as influenced by supplemental phytase was studied in eight horses consuming four diets in a 4 x 4 Latin square design experiment. The treatments were a control (containing a low P level, 18.4 g/d) and three high-P diets. These diets contained P as monocalcium phosphate (MCP; 43.7 g/d), myoinositol hexakisphosphate in the form of wheat and rice bran (MIHP; 41.8 g/d), or MIHP with microbial phytase (MIHPP; 42.5 g/d). The proportions of phytate-bound P were 3, 1, 55, and 56% for the control, MCP, MIHP, and MIHPP, respectively. The MIHPP diet was supplemented with 300 phytase units (FTU)/kg (as-fed basis). Feces and urine were collected quantitatively and analyzed for P, Ca, and Mg. Urinary P excretion was lower (P < 0.05) with the control diet (0 g of P/d) than with the MCP diet (1.0 g of P/d). The low urinary P excretion (0.3 g of P/d) for the MIHP diet suggested low P availability compared with the MCP diet, but apparent digestibility of P expressed as a percentage of intake did not differ (P = 0.065) between these diets. Apparent Ca digestibility was lower (P < 0.05) for the MIHP diet than for the MCP diet (26.4 vs. 42.4%). This difference may have been caused by the origin of the Ca in these die...Continue Reading

References

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Mar 30, 2001·American Journal of Veterinary Research·D M HasselJ R Snyder

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Citations

May 9, 2012·Journal of Environmental Quality·Paulo H Pagliari, Carrie A M Laboski
Dec 8, 2015·Journal of Animal Science·A L FowlerL M Lawrence
Jan 19, 2020·Animals : an Open Access Journal From MDPI·Markku SaastamoinenElisa Valtonen
Jan 14, 2020·Pakistan Journal of Biological Sciences : PJBS·H H AzzazH A Murad
Jul 30, 2010·Journal of Animal Physiology and Animal Nutrition·D A van DoornA C Beynen
Aug 19, 2007·Journal of Dairy Science·K F KnowltonK F Wilson
Oct 29, 2014·Journal of Animal Science·D A van DoornA C Beynen

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