Abstract
From the results of bio-test of albino rat, it is considered that biopotency of vitamin A in fish liver oil is not different from all-trans vitamin A. But only when isomarization of vitamin A in sample is serious, its growth effect is less than all-trans vitamin A.
To examine these results on chick, various administrations of vitamin A in fish liver oil was conducted and the following results were obtained.
1) Growth effect of vitamin A in fish liver oil was not different comparing to all-trans vitamin A.
2) When administering amounts of NRC requirement or a half, fish liver resources was rather superior to synthetic resources.
3) Feed efficiency ratio and PER of vitamin A in fish liver oil group were superior in most cases.
4) Superior growth effect was not recognized significantly at administration of dose over the NRC.
5) Superiority of vitamin A in fish liver oil was considered due to containing “fish liver oil factor”
