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Studies in the Normal Depositions of Minerals in the Bones of Dairy Calves^*

Department of Dairy Husbandry, Pennsylvania Experiment Station, State College Pennsylvania

ABSTRACT

The composition of the frontal, ribs, femurs, and humeri of seven normal male Holstein calves are presented. These calves were 60, 90, 120, 150, and three of 180 days of age. The analyses indicate that the ribs, femurs, and humeri are suitable for the study of mineral deposition in the bones of calves. Because of early calcification a section of the frontal bone is of less value. The complete bones give a truer picture of mineral deposition than a cross section portion of them. The percentage of ash based on fat and moisture-free bone and ash per cubic centimeter of bone volume proved to be the most valuable data. The ratio of ash in fresh bone to organic residue may also give a useful index of bone condition.

^* Published by permission of the Director of the Pennsylvania Experiment Station as paper Number 423, Journal series. The data in this paper were taken from a master's degree thesis submitted by J.H. Kruger to the graduate Faculty of the Pennsylvania State College. Received for publication February 10, 1927.