4Divakala K C, Chiba L I, Kamalakar R B, et al. Amino acid supple- mentation of hydrolyzed feather meal diets for finisher pigs[ J]. Jour- nal of Animal Science,2009,87 (4) : 1270 - 1281.
5Anbu P, Hilda A. Purification of keratinase from poultry farm isolate Scopulariopsis brevicaulis and statistical optimization of enzyme activity [ J ]. Enzyme and Microbiological Technology,2005,36:639 - 647.
6Marshall R C, Orwin D F, Gillespie J M. Structure and biochemistry of mammalian hard keratin[J]. Electron Microscopy Reviews, 1991, 4(1) :47 -83.
7Nickerson W J. Keratinase [ J]. Biochem Biophys Acta, 1963,77: 87 - 99.
8Kunert J. Biochemieal mechanisms of keratin degradation by action- myeete Streptomyee fi'adiae and fungus Microsporium gypseum, a eom- parison[ J]. Journal of Basic Microbiology, 1989,27:597 - 604.
