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Phosphoric Acid as a Phosphorus Source for Beef Cattle^{1, 2,}

Kansas Agricultural Experiment Station, Manhattan

Abstract

Studies with rations containing no supplemental phosphorus and supplemental phosphorus from phosphoric acid or steamed bone meal were conducted with 74 Hereford heifer calves during wintering and fattening phases. There were no statistically significant differences among any of the lots in weight gains during the wintering phase. Supplemental phosphorus increased serum phosphorus over the controls in all cases (P<.01). Bone meal produced higher blood phosphorus levels than phosphoric acid when each was fed at 3 gm. phosphorus per day. However, there was no evidence of a difference due to source of phosphorus at the 6 gm. level. Serum calcium was lower (P<.01) in all lots receiving supplemental phosphorus. In the fattening phase, there was no significant difference in gains due to supplemental phosphorus or source of supplementation except in one case. Phosphorus supplementation increased bone wall thickness (P<.01). Steamed bone meal produced thicker bone walls (P<.01) than phosphoric acid when fed at 3 gin. phosphorus per day. There were small, but significant (P<.05) differences in percent bone ash, with steamed bone meal producing higher ash percentages. It was concluded that phosphoric acid is an acceptable source of supplemental phosphorus.

¹ Contribution No. 256, Department of Animal Husbandry.

² This study was supported in part by grants from Westvaco Mineral Products Division, Food Machinery and Chemical Corporation, New York 17, N. Y.

³ Presently Extension Livestock Specialist, Oklahoma State University, Stillwater.