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Evaluation of Urea Ammonium Polyphosphate as a Phosphorus Source for Dairy Calves^1,2,

University of Kentucky, Lexington 40546-0215

Abstract

Sixteen Holstein and eight Jersey calves were used to compare the availability of urea ammonium polyphosphate (UAPP) with dicalcium phosphate (DICAL) as a source of P. The calves (avg wt 97 kg at start of trial) were depleted for 2 wk with a. 16% P basal diet and then switched to one of four treatments in a 2 x 2 factorial arrangement for 8 wk. DICAL or UAPP was added to the basal diet to raise the total P (dry matter basis) to .24 or .31%. Thirteen response criteria were used; among them, bone ash, breaking strength of tibia and body growth proved to be sensitive and accurate indicators of P availability. Increasing dietary P from .24 to .31% increased feed intake; body weight gain; plasma inorganic P; breaking strength of the tibia and seventh, eighth and ninth ribs, and bone ash of the femur and 10th rib. Ca and P concentrations in the femur did not change with" increasing dietary P. There were no consistent significant differences between DICAL and UAPP as P sources.

¹ This manuscript (81-5-70) is published with the approval of the Director of Kentucky Agr. Exp. Sta.

² Dept. of Anim. Sci.

³ Present address: Dept. of Anim. and Vet. Sci., Univ. of Maine, Orono 04469.