NEW NUTRITIONAL FACTORS REQUIRED BY THE CHICK

Abstract

NutritionalFactors Required by Chick in any case although all the known factors required by t.he chick were, incorporated into the experimental rations.Very recently Hogan and Boucher (6) have reported a successful attempt to compound a ration which is adequate for chickens through one generation.It is our purpose in this paper to demonstrate that a synthetic diet containing ample quantities of vitamins A, B,, Bz, and D cannot support normal development in young chicks until two additional factors, bot,h present in liver, are supplied, and that one of these factors is identical with vitamin R+ which Reader and coworkers have found to be essential for the rat.EXPERIMENTAL Day-old white leghorn chicks were used exclusively as experimental animals.They were divided into groups of seven and placed in pens equipped with wire screen bottoms and suitable warmers.The basal synt)hetic diet which was used throughout the entire work had the following composition.pm cent