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The Influence of Phosphorus, Calcium and Vitamin D₃ Upon the Fat Content of the Skeleton in Growing Pigs

The Animal Research Station of the Royal Agrioultural College of Sweden

1. Feeding experiments with pigs were carried out where the diet consisted of grain, such as barley, oats, and corn, and, in addition, 2.5 kg of skimmed milk daily per animal was given. In some cases Ca was added to the diet, in other cases P, and in other instances vitamin D₃. The experimental period included a time of 3 months or more, and continued from a weight of the animals of 35–45 kg up to 100 kg or more. Among other observations which were carried out in connection with the experiment, the fat content of a bone of the skeleton of the animals was studied.

2. Calcium, or phosphorus, or both elements together, decreased the content of fat in the femur when the elements were added as supplements to the diet mentioned. This observation of ours made on a long, hollow bone, such as the femur, agrees with that made by Petersen on a flat bone, the scapulae.

3. Vitamin D₃ appeared to increase the amount of fat in the femur when this vitamin was given to the pigs under the conditions described. When other Ca or P was given simultaneously as a supplement to the diet the increase in fat content in the bone was less pronounced. It therefore appears as if Ca and P on the one hand and vitamin D₃ on the other counteract each other in this influence upon the fat content of the skeleton.