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A Study of Calcium and Phosphorus Balances with Dairy Cattle

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

1. The results of twelve determinations of the balances of intake against outgo of calcium and phosphorus with liberally milking dairy cows are given.
   
2. A better assimilation of calcium resulted when clover hay instead of timothy was fed as part of a ration which included corn silage and a grain mixture.
   
3. A better assimilation of calcium occurred under conditions where protein of supposedly higher quality was fed through the medium of clover hay.
   
4. Some independence between calcium and phosphorus assimilation was observed.
   
5. Better assimilation of phosphorus occurred when more ample provision was made for this element in the grain mixture.
   
6. There was but little variation in the calcium and phosphorus content of the milk under the conditions studied. The percentage of phosphorus in the milk seemed to increase slightly in response to an increased supply in the feed.
   

¹ Also presented to the Faculty of the Graduate School of Cornell University, September, 1925, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.Note: The author wishes to express his appreciation to Dr. L. A. Maynard and W. E. Krauss for many valuable suggestions and assistance given in conducting the experimental work.