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Journal of Dairy Science Vol. 75 No. 7 1979-1986
© 1992 by American Dairy Science Association ®
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Disappearance of Phosphorus in Phytate from Concentrates In Vitro and from Rations Fed to Lactating Dairy Cows

D. Morse 1, H. H. Head 1, and C. J. Wilcox 1

1 Dairy Science Department, University of Florida, Gainesville 32611-0920

Objectives were to determine concentrations of P in phytate in selected concentrates, disappearance of P in phytate from these concentrates in vitro, and extent of hydrolysis of phytate in vivo. Total P and P in phytate were determined for eight concentrates; 32 to 81% of total P was in phytate. Six concentrates were incubated in vitro to determine the extent of phytate disappearance from solids and its appearance and disappearance from solution. Greater than 90% of P in phytate disappeared from solids between 6 and 8 h of incubation in vitro (wheat middlings, rice bran, hominy, soybean meal, and dried distillers grains) or between 12 and 24 h (cottonseed meal). Phosphorus in phytate in solution was hydrolyzed by 12 h except for cottonseed meal (by 24 h). Hydrolysis of the inositol ring to release P in vivo was greater than 99%, based on total fecal collection from 11 cows and the use of Cr as an indigestible marker in excreta, and between 94 to 98% for the same samples when acid detergent lignin was used as an indigestible marker to calculate phytate disappearance. These results further indicate that P in phytate should be considered available to lactating dairy cows when rations to meet their P requirements are being formulated.

Key Words: phytate phosphorus • concentrates • in vitro • hydrolysis

Submitted on October 7, 1991
Accepted on March 9, 1992




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