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Effect of various levels of calcium, phosphorus and vitamin D intake on bone growth. I. Foxes

Effect of various levels of calcium, phosphorus and vitamin D intake on bone growth. I. Foxes

J. Nutrition. 43: 153-165

One hundred and twenty-eight fox pups received, from the age of 50 days to time of pelting at 245 days, a basal diet of various natural animal and vegetable products. Ca carbonate and anhydrous secondary Na phosphate were added and 0, 15, 50 or 200 I.U. vitamin D per kg. bodyweight were given weekly to provide a total of 64 diets containing 0.3, 0.4, 0.6 or 0.8 per cent. P with 0.3, 0.5, 0.6 or 1.0 per cent. Ca. The ratio of Ca to P ranged from 0.5 to 3.3. Radiographic examination was made of the tibia and fibula after 150 days and total ash was estimated in the humerus. The level of vitamin D had little effect on shape or density of bone. Humeri from foxes receiving 0.3 and 0.5 per cent. Ca and 0.3 and 0.4 per cent. P were lacking in minerals and were more bent and thicker than from those receiving the larger amounts. A high Ca to P or P to Ca ratio caused mineral poverty and bent, thickened bones. Other deficiency signs included lameness, enlarged joints, undershot jaw, cranial enlargement and recurrent spasms. Satisfactory percentages of Ca and P for growing foxes appeared to be from 0.6 to 1.0 and from 0.6 to 0.8, respectively, corresponding to ratios of Ca to P of between 1 and 1.7 to 1. An intake of 2001.U. vitamin D per kg. bodyweight weekly with the 0.82 I.U. contained per g. in the basal diet was not above the limit for optimum physiological efficiency. There was no difference in requirement of Ca, P or vitamin D for male and female foxes. The humeri of male foxes had more total ash and greater volume, and the fresh and ether-extracted dried humeri weighed more, than in females. Until deficiency developed the foxes gained 0.6 to 0.7 lb. weekly; diets producing normal bones produced normal pelts.

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Accession: 013695225

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PMID: 14851035

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