THE NUTRITIVE VALUE OF MARINE PRODUCTS: VI. THE VITAMIN A POTENCY OF SALMON LIVER OIL

Abstract

The vitamin A content of liver oils of five species of salmon in the genus Oncorhynchus has been determined. The richest samples contained 40 times, and the poorest twice as much vitamin A per gram as a sample of cod liver oil stated to contain 500 A.D.M.A. units per gram. Potencies of samples were in descending order: Skeena spring, Vancouver spring and sockeye, coho, pink and chum salmon. Oil content of the livers averaged 5 per cent and percentage of liver in the fish 2 per cent. The melting point, unsaponifiable matter and iodine value of the oils have been determined.