Abstract
1) The growth effect of the fish liver oil vitamin A is not different from that of the all-trans vitamin A.
2) At the dosage of one half of or more than the required quantity, the fish liver oil vitamin A shows a little better effect.
3) The fish liver oil gives better feeding and protein efficiencies.
4) No difference in growth is seen compared with vitamin A resources when fed at N.R.C. level or more.
5) The difference of growth effect between the fish oil vitamin A and the synthetic one, suggests existence of some elements in the fish liver oil.
