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Effect of Work on the Calcium and Phosphorus Retention of Percheron Geldings¹

Iowa Agricultural Experimental Station

Abstract

The calcium and phosphorus retentions of a pair of Percheron geldings weighing about 1680 pounds each were determined as a part of an experiment that also included a study of nitrogen balances. During several consecutive metabolism periods of two weeks duration, each horse developed approximately 0, 0.56, 0.93, and 1.27 average horse power for more than four hours each day. The average daily intakes of calcium and phosphorus throughout the trial were between 18 and 19 grams per horse.

Neither the maintenance ration of three pounds oats and twenty pounds timothy hay, nor the same ration fortified during the work periods with additional energy as sugar and dextrinized starch supplied sufficient calcium and phosphorus to meet the requirements of these horses. Yet, these rations were adequate to maintain the horses in positive nitrogen balance at all times. It is not improbable when horses of this type and size are limited to rations containing no more calcium and phosphorus than were fed during this experiment that some of them would be receiving insufficient amounts of these elements to satisfy their needs.

¹ Journal Paper No. J-1042 of the Iowa Agricultural Experiment Station. Project No. 473.

² Abstract of part of senior author's doctoral thesis.