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Mineral Metabolism of the Lactating Cow

University of Wisconsin

Abstract

Definite evidence has accumulated from the work of many investigators that on most rations, during the early part of lactation, the milking cow loses lime from her skeleton. It is also becoming apparent, particularly from studies over entire lactation periods, such as those conducted by Huffman and associates (1), and Ellenberger and associates (2) that a point will be reached in the lactation period where storage of calcium and phosphorus in the skeleton will again take place. Metabolism experiments are of very great value, but few of them can run over entire lactation periods. In addition, assimilation of minerals is so decidedly influenced by the nervous state of the animal that it is barely possible that long time metabolism experiments may not give a true picture of the mineral metabolism of a cow kept under natural conditions. Consequently we believed that we could add to our knowledge of this subject by determining the mineral status of the skeletons of cows that had received for a number of years rations that differed widely in their content of lime and phosphorus.