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Vitamin a Utilization Studies

I. The Utilization of Vitamin a Alcohol, Vitamin a Acetate and Vitamin a Natural Esters by the Chick

Research Laboratory, Collett-Week-Nibecker, Inc., South San Francisco, California

1. Vitamin A Liver storage tests were used as the criterion for determining the relative utilization of the alcohol, acetate and natural ester forms of vitamin A by the chick under various experimental conditions.

2. Wide variations in the storage of vitamin A in the livers of chicks were found, depending both on the form of vitamin A fed and on the character and quantity of diluent. The experimental data were subjected to analyses of variance, and the statistical significance of a great part of the data was established. The importance was demonstrated of factors affecting the hydrolysis of vitamin A esters in vitamin A utilization. The following carriers were shown to contain factors inhibiting vitamin A ester hydrolysis: jojoba seed oil, ethyl laurate, basking shark liver oil and mineral oil. Sardine oil was shown to contain factors which interfere with the hydrolysis of vitamin A natural esters, although not with the hydrolysis of vitamin A acetate. Although statistical significance was not demonstrated, it appears likely that cottonseed oil and corn oil also contain small amounts of factors which interfere with vitamin A ester hydrolysis.

The existence of factors affecting vitamin A absorption per se was also demonstrated.