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The Influence of Sources of Phosphorus on the Relative Efficiency of Vitamin D₃ and Cod Liver Oil in Promoting Calcification in Poults¹

One Figure

Poultry Department, Storrs Agricultural Experiment Station, Storrs, Connecticut

conclusions

1. When the diet contains adequate amounts of readily available phosphorus, vitamin D from activated 7-dehydrocholesterol and from cod liver oil produce approximately equal calcification in poults.

2. Vitamin D from activated 7-dehydrocholesterol is more effective than that from cod liver oil in promoting calcification in poults which are forced to rely upon phytin phosphorus to meet their requirements for this mineral. This difference in efficacy ranges from 6.8:1 to 1.04:1 and varies inversely with the level of vitamin D in the feed.

3. With but one exception (Jukes and Sanford, '39) the discrepancies which appear in the literature as to the vitamin D requirement of turkey poults can be explained for the most part at least, on the basis of the availability of the phosphorus used with the various sources of vitamin D in the diet. When the diet is relatively high in the percentage of non-cereal phosphorus, both forms of vitamin D are effective at the lower levels reported. When the diet is relatively high in cereal phosphorus the vitamin D from cod liver oil is less effective and the greater efficacy of activated animal sterols manifests itself.

Manuscript received 17 November 1945.