A thermotolerant Streptomyces graminofaciens was isolated which could diges
t chicken feather at 40 degrees C very efficiently. The majority of the fra
gments produced during feather digestion was in the range of colloid partic
les or even smaller. The maximum amount of feather in the medium which coul
d be digested in 1 week in submerged culture was 10%. The procedure did not
require previous mechanical disruption of the feather which makes the appl
ication fast and easy.