Abstract
Two experiments were conducted with rats to evaluate the protein quality of a series of wheat by-products, which served as the sole source of protein in diets calculated to contain 10% protein. Digestibility of nitrogen and percentage absorption of amino acids were compared with weight gain, feed efficiency and net protein utilization (NPU) as criteria. Percentage absorption of different amino acids was found to vary considerably in the same protein. Of the essential amino acids, lysine, threonine, methionine and isoleucine had the lowest percentage absorption in all of the products tested. The results indicate that the amount of amino acids absorbed, as measured by the excretion method, may be a more satisfactory measure of protein quality than total amino acid content.
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