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Calcium and Phosphorus Metabolism in Dairy Cows

IV. The Assimilation of Calcium Fed as Calcium Gluconate

Research Laboratories, Bureau of Dairy Industry, United States Department of Agriculture, Beltsville, Maryland

ABSTRACT

Introduction

Recent interest in gluconic acid has brought about improved methods of production (1) and developed uses for its calcium salt, in which form it is chiefly obtained. The calcium salt, because of its solubility, lack of taste, and other valuable qualities, has been found advantageous for use in calcium therapy (2). For this reason it seemed of interest to determine whether a compound of this particular type (containing five hydroxyl-groups) could be readily assimilated from the alimentary tract and so prove a valuable source of supplementary calcium in the ration of lactating cows. Accordingly a balance experiment was undertaken to investigate this point.

Experimental

Two pure-bred, three-year old, Holstein cows, in their first lactation were placed in the metabolism stalls on November 30, 1929. Cow 212 had calved August 7, 1929, and was giving 21 kgm. of milk per day. Cow 213 had calved August 13, 1929, and was giving 19 kgm. of milk per day.