Syntheses and growth activities of all-trans vitamin A amide, all-trans vitamin A nitrile and their A9 and/or delta 13 cis isomers. Internat. Ztschr
Van Leeuwen, P.H.; Roborgh, J.R.; Wesselman, P.G.J.
Internationale Zeitschrift für Vitaminforschung 38: 138-141
All-trans vitamin A amide added to the diet of chickens as a solution in groundnut oil, in an aqueous dispersion and as prills (a preparation containing sugar and gelatin) had 34, 61 and 68% of the activity of all-trans vitamin A acetate.