Abstract
INTEREST has grown in the use of feathers and poultry offal (blood, viscera, heads and feet) as components of poultry rations. Disposal problems associated with an accumulation of these waste materials at poultry processing plants have led many to inquire into possible uses for such wastes. While untreated offal and feathers have been applied directly to the soil as fertilizer, this method of disposal is generally unsatisfactory.The keratin proteins have generally been considered to be of little nutritive value because of their structure, insolubility and consequent indigestibility. Mangold and Dubiski (1930) conducted balance studies which failed to show any digestion of quills of white goose feathers when these were fed to owls, cats, dogs and rats. Routh (1942) found that powdered feathers were capable of supporting moderate growth in the young rat when supplemented with tryptophan, methionine, histidine and lysine. Wagner and Elvehjem (1942 Wagner and Elvehjem (1943) showed that rats and …
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