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The Minimum Phosphorus Requirement of Lambs for Phosphorus Equilibrium¹

Oklahoma Agricultural Experiment Station²

Abstract

In reviewing the mineral nutrition of farm animals, Mitchell and McClure (1937) pointed out the need for further information on the calcium and phosphorus requirement of sheep. Several years later Beeson and associates (1944) (1945) reported the results of their studies of the phosphorus requirement of fattening lambs and ewes for gestation and lactation. In an extensive series of feeding trials, these investigators found that for fattening lambs a level of o.z2 percent of phosphorus in rations was inadequate, 0.14 percent was borderline, and 0.15 percent or more of phosphorus was adequate as judged by the rate of gain, efficiency of feed utilization, and maintenance of blood phosphorus levels. From these results, the minimum phosphorus requirement of fattening lambs appeared to be close to 2.17 grams daily per 100 pounds of live weight. The requirement for lactation was found to be higher than that for fattening or gestation. References to

¹ This investigation was supported in part by a research grant from E. I. du Pont de Nemours and Company Inc.

² Departments of Agricultural Chemistry Research and Animal Husbandry.