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The Physiological Effect of Rations Restricted Principally or Solely to the Alfalfa Plant

III. The Influence of Various Mineral Supplements on the Calcium, Phosphorus and Nitrogen Metabolism of Dairy Cattle¹

Department of Agricultural Chemistry

I. R. Jones and P. M. Brandt

Department of Dairy Husbandry, Oregon Agricultural Experiment Station, Corvallis, Oregon

ABSTRACT

We have reported a series of metabolism studies in which the nitrogen, calcium and phosphorus balances of dairy cattle were determined for 16 five-day periods, during which the daily milk yields varied from approximately 10.5 to 15 kgm. The rations fed consisted of alfalfa hay with and without supplements of di-sodium phosphate, calcium carbonate or bone flour.

The nitrogen balances were sometimes positive and sometimes negative. Feeding di-sodium phosphate resulted in slightly positive phosphorus balances. Feeding bone flour resulted in positive calcium and phosphorus balances. A supplement of calcium carbonate did not appear to affect the storage of either calcium or phosphorus.

The relation of these studies to the practice of restricting dairy cattle principally to alfalfa has been discussed in this paper.

¹ Published as Technical Paper No. 148 with the approval of the Director of the Oregon Agricultural Experiment Station