J. Anim Sci.
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J. Anim Sci. 1957. 16:444-450.
© 1957 American Society of Animal Science
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Availability of Phosphorus in Mineral Supplements for Beef Cattle

T. A. Long1, A. D. Tillman, A. B. Nelson, Willis D. Gallup and Bill Davis

Oklahoma Agricultural Experiment Station2

Abstract

Two feeding trials were conducted with grade Hereford steers to compare the effects of different percentages of supplemental phosphorus on feed consumption, weight gain and inorganic phosphorus in the plasma as measures of phosphorus nutrition. The steers were individually fed low-phosphorus (0.07 and 0.09%) rations alone and supplemented with NaH2PO4 in amounts to provide from 0.11 to 0.19% total phosphorus.

Feed intake, weight gain and plasma phosphorus increased with increased amounts of supplemental phosphorus in the ration over the range of 0.07, 0.11, 0.15 and 0.19% total phosphorus. Plasma phosphorus was especially sensitive to change in phosphorus intake but showed periodic variation.

Steamed bone meal, Curacao Island phosphate and dicalcium phosphate were compared as sources of phosphorus with heifers fed rations containing a total of 0.15% phosphorus. Heifers on the 0.07% basal ration declined in feed intake, made small gains, and their plasma phosphorus decreased. Those on the supplemented rations were normal according to these criteria, and any difference between them related to phosphorus source was not statistically significant. The results indicated equal availability of phosphorus1 in the three supplements.

Footnotes

1 Present address: Department of Animal Nutrition, Pennsylvania State University.

2 Departments of Animal Husbandry and Agricultural Chemistry, Stillwater.






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Copyright © 1957 by the American Society of Animal Science.