Dietary Interrelations Between Methionine, Glycine, Choline, Protein Level and Energy Content of the Chick Diet , ,

METHIONINE and choline have been shown to be beneficial additives to a broiler diet by several workers; however, there are differences of opinion concerning the level required and the degree of response obtained from these materials. Information concerning glycine is even more controversial since workers fail to agree as to whether or not glycine is a beneficial additive. Many workers in the field of nutrition today feel that the requirement of a bird for a given nutrient is not a definite figure, but that it varies with the level of other nutrients in the diet. This is particularly true with respect to protein level and energy content. Rosenberg et al. (1955a) reported that the benefits obtained from the addition of fish meal and methionine together to chick diets, that contained protein levels which were calculated to supply the chick's requirement of sulfur containing amino acids, were greater than would be …