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Journal of Nutrition Vol. 25 No. 4 April 1943, pp. 309-317
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Vitellin, Casein, Liver and Muscle Tissue as Sources of Phosphorus for the Rachitic Rat1

Rudolf Bunkfeldt and Harry Steenbock

Department of Biochemistry, College of Agriculture, University of Wisconsin, Madison

Studies on the availability of phosphorus for calcification of bone in the rachitic rat on a high-calcium diet revealed that the phosphorus of ovo-vitellin is present in a different form from that occurring in casein. While it took more than twice as much vitellin phosphorus as inorganic phosphorus at a Ca/P ratio of 3/1 to produce the same degree of calcification, casein phosphorus was found equal in value to inorganic phosphorus under the same experimental conditions. The phosphorus from pork loin was definitely less available than inorganic phosphorus but not to the same degree as vitellin phosphorus. Pork liver and ovo-phospholipid phosphorus approximated inorganic phosphorus in value.

1 Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

Manuscript received 30 November 1942.




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