The vitamin A potency of fish liver oil and its effect on the growth of albino rat

The vitamin A potency of fish liver oil was determined by the growth tests and the liver storage tests of albino rats, and the relationship between the maleic value and the bio-potency was confirmed.Even in the lower level of the needed dose, the difference between the synthetic vitamin A oil and the fish liver oil was not occured in the non deficient period.In the feeding level, the vitamin A potency of fish liver oil was shown better than that of the synthetic vitamin A oil by their growth effects.By the comparison of the values obtained by various methods, the relationship between the vitamin A potency to all-trans vitamin A and the value obtained by spectrophotometry was discussed.By the corrected equation obtained from the bio-tests in this report, the vitamin A potency estimated by the maleic value was about 10% higher than that obtained by the original method, and the vitamin A potency of fish liver oil having more than 78% of relative bio-potency was equal to that obtained by the spectrophotometry.