Glycine in Broiler Nutrition

Abstract

ABSTRACT SINCE the discovery of vitamin B12, it has been possible to formulate poultry feeds using vegetable products as the sole source of protein. One of the most widely used of these products is soybean oil meal. It has been shown by analysis to be deficient in methionine for the chick (Almquist, 1957). Therefore, when soybean oil meal constitutes the principle source of protein in a broiler feed, methionine becomes the first limiting amino acid. Early work using methionine supplementation of broiler feeds gave somewhat inconclusive results which have been partially explained by later work. Baldini and Rosenberg (1955) observed a relationship between the methionine requirement of the chick and the productive energy content of the diet. They concluded that the methionine requirement of the chick, expressed in percent of diet, increased as the productive energy level of diet increased. Further work by Rosenberg and Baldini (1957), indicated a relationship between . . .