The effect of pulverized limestone and dicaleium 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 dicaleium phosphate did not have this effect. The feeding of diealcium 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 ealeimn and phosphorus on feed utilization.
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Golovos et al. (1958) studied this question.
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