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Availability of Phosphorus in Wheat Bran when Fed to Ponies

Equine Research Program Cornell University, Ithaca, N. Y. 14850

Abstract

A SERIES of balance trials were conducted with ponies to determine the utilization of phosphorus (P) in wheat bran and factors which affect its utilization. The average estimated true digestibility of P in diets in which wheat bran supplied a significant amount of the total dietary P was 29.5±3.0%. The addition of Ca or steeping wheat bran in 50 C water for 1 hr. did not influence P utilization but feeding 83,000 IU of vitamin D₃ daily to ponies increased digestibility by about one third. It was concluded that the P in wheat bran is about one half as available as the P in supplements such as NaH₂PO₄, dicalcium phosphate and bone meal and differences in availability should be considered when balancing rations for horses.

¹ The authors wish to acknowledge the assistance of J. Cooper, P. Daniluk, S. Hallett, C. Marquis, J. Lowe, K. O'Neil and J. Williams.

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