Amino Acid Requirements Of Man Research Articles

Amino acid composition and biological evaluation of the protein quality of high lysine barley genotypes.

The protein quality of high lysine barley genotypes Notch1 Notch2, Riso-1508 and Hiproly grown in Indian soil was evaluated by determining amino acid composition and also by rat growth and nitrogen balance studies. Protein and fat contents were found to be highest in Riso-1508. Lysine concentration (5.26 g/16g N) of Riso-1508 was also highest compared to the other high lysine genotypes. Rat feeding trials indicated that the growth promoting qualities of the proteins of genotype Riso-1508 were significantly (p < 0.05) higher than the low lysine barley genotype. The comparatively low lysine barley diet had more digestible protein than the high lysine barley diet. However, the BV and NPU of the high lysine barley were significantly (p < 0.05) higher. This improvement is of importance in meeting the essential amino acid requirements of man as well as other monogastric animals. The study showed that the high lysine barley harvested in Indian agroclimatic conditions retained high lysine quality.

A Conspectus of Research on Amino Acid Requirements of Man

A Conspectus of Research on Amino Acid Requirements of Man

An Improved Free Amino Acid Diet for Growing Chicks

Although Almquist and Grau (1944) and Almquist (1947) were able to grow chicks on free amino acid diets, the rate of growth obtained compared with that on protein-containing diets was very poor. There have been several recent unsuccessful attempts to improve the earlier diets of Almquist (Glista, 1951; Lewis, 1953). From the results of his extensive work, Lewis concluded that proteins provide unknown growth essentials not supplied by the free amino acids. Since these studies, Rose et al. (1954), in their classical studies on the amino acid requirements of man, pointed out that the energy intake must be significantly increased upon changing from an intact protein to hydrolyzed protein to free amino acids. Incorporating these findings in their work, Fisher and Johnson (1956) succeeded in formulating a free amino acid diet on which hens would maintain normal production. Since egg production seems to be a more sensitive criterion of dietary …