The amino acid deficiencies of certain plant proteins and the supplementary effect between plant proteins as measured by means of their biological values

Abstract

The supplementary effect of methionine on lucerne, lysine on oats seed, cystine and methionine on peanutmeal, cystine on linseedmeal as well as the supplementary relationship between yellow maize and lucerne and of yellow maize and soyabeans have been determined by means of their biological values. From the results obtained it is concluded: 1. That 0.2 per cent. dl-methionine increased the nitrogen utilization of the lucerne proteins by 30±1.64 per cent. 2. Cystine has no supplementary effect on peanutmeal, while methionine improves the protein to a slight extent. 3. Cystine supplementation increases the nitrogen utilization of linseedmeal by 8±2.04 per cent. 4. Lysine supplementation has no significant effect on the proteins of whole oats seed. 5. The proteins of whole yellow maize and lucerne and of whole maize and soyabeans supplement each other in a marked and significant manner.