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Effect of Pulverized Limestone and Dicalcium Phosphate on the Nutritive Value of Dairy Cattle Feed¹

Departments of Dairy Husbandry and Agricultural and Biological Chemistry, New Hampshire Agricultural Experiment Station, Durham

ABSTRACT

The effect of pulverized limestone and dicalcium phosphate supplements on the nutritive value of dairy cattle feed was studied, with 12 dairy heifers receiving either an all roughage or a mixed ration. Results of these experiments indicate that pulverized limestone when added to both all roughage and mixed rations for dairy heifers decreased the digestibility of both protein and energy. Similar amounts of dicalcium phosphate did not have this effect. The feeding of dicalcium phosphate along with pulverized limestone decreased the depressing effects of the limestone. These results would indicate that the feeding of calcium in excess of requirements, particularly in wide calcium: phosphorus ratios, may reduce the digestibilities of protein and energy. These results further indicate a need for additional work on the effects of different levels of calcium and phosphorus on feed utilization.

¹ Published with the approval of the Director of the New Hampshire Agricultural Experiment Station as Scientific Contribution No. 205.