Cystine and Protein Relationship of Grasses

Abstract

AN interesting relationship between the cystine content and the protein content of grasses collected through different periods of the year has been established. A coefficient of correlation of +0.923 for 10 pairs, indicating an almost perfect relationship between the protein content and the cystine content of the grasses throughout the year, is demonstrated. The accompanying curves (Fig. 1) show a marked fall in both the protein and cystine contents of the grasses through the winter months, with a corresponding rise of both during the commencement of the rainy season during September and October. As would be expected, the rainfall curve shows a fair correlation between protein and cystine contents.