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Minerals in the Nutrition of Dairy Cattle¹

Michigan Agricultural Experiment Station

Abstract

Numerous investigations have shown that dairy cattle require many minerals which are intimately involved in all of the metabolic processes. Most of the required minerals, however, are furnished by ordinary good dairy rations. This paper is limited to a discussion of the three essential minerals. which are most likely to be lacking in the ration of dairy cattle, other than those in common salt; namely, iodine, calcium, and phosphorus. Some of the newer aspects of magnesium metabolism will also be considered.

IODINE

The need for iodine in the ration for the prevention of "big neck" or goiter in calves has long been known (1) (2) (3). At the present time there is very little evidence that the addition of iodine above that required for the prevention of goiter is advantageous. Claims are frequently made that the feeding of iodine prevents or cures sterility and that it prevents the retention of the placenta. The question of the relative value of organic and inorganic sources of iodine is one which is also receiving considerable attention by commercial organizations who are interested in the sale of iodine salts and organic sources of iodine. There is little evidence, however, to back up such claims.

¹ Journal Article 200 n. s.