A modified Udy method of protein determination and an amino acid analyzer method were compared for lysine screening in a number of lines and cultivars of barley (Hordeum vulgare and H. distichum). The lysine values obtained with the modified Udy procedure gave a correlation coefficient of + 0.96 with the analyzer lysine expressed as grams of lysine per 100 g meal, and a correlation coefficient of + 0.80 when the lysine values were expressed as grams of lysine per 100 g of meal protein. The modified Udy method was satisfactory for initial screening of lysine in barley genotypes.
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Bhatty et al. (1975) studied this question.