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The Metabolism of Calcium, Magnesium, Phosphorus and Sulfur in Dairy Cows Fed High and Low Protein Rations

Dairy Husbandry Department, Ohio Agricultural Experiment Station, Wooster, Ohio

ABSTRACT

Eight balances of calcium, magnesium, phosphorus, sulphur and nitrogen are reported. Four of these balances were determined on cows receiving high protein rations, and 4 on cows receiving low protein rations.

The cows were all producing liberal quantities of milk, although in most cases, they had passed the period of maximum production. They were also at or near their minimum live weight.

The mineral content of the narrow rations was higher, especially in phosphorus and calcium.

All the cows receiving the high protein rations were found to be storing calcium, while those receiving the low protein rations were found to be losing this element. It is suggested that this difference in calcium storage was due to the larger amounts of clover hay contained in the high protein rations. The clover hay used was fresh hay that had not been subjected to an excessive amount of bleaching in the direct sunlight. The data here presented show the possibility of calcium retention with liberal milk production.

In the 1921 experiment, the phosphorus balances for the two groups of cows were somewhat similar, losses being noted in all cases. The results of the 1922 experiment indicate that the narrow rations, here used, would permit a greater phosphorus retention than the wide rations.

The magnesium, sulphur and nitrogen balances of the high protein fed cows show no marked difference from the corresponding balances of the low protein fed cows.