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Under What Conditions Are Calcium and Phosphorus Supplements Needed in the Feeding of Farm Animals?

University of Wisconsin

Abstract

The occurrence of phosphorus deficiency diseases among ruminants in different parts of the world may make one wonder how consistently phosphorus needs to be added to rations of livestock. In general it is phosphorus rather than calcium which is apt to be lacking in rations of ruminants, which deficiency is frequently exhibited by a depraved appetite. Huffman and coworkers, however, point out that anorexia in cattle, or lack of appetite, for roughages, is a better criterion of phosphorus deficiency in certain rations than is a depraved appetite. As to possible calcium deficiencies, recent work at the Minnesota Experiment Station has shown that cattle can adjust themselves to a very low intake of calcium.

Calcium and phosphorus have usually been studied together or in relationship to each other. Small animal work leads us to assume that only in the presence of a generous amount of vitamin D may the calcium-phosphorus ratio be drastically different from what is considered the normal, and still permit proper growth on the part of the animals.