feather liquid medium. you need to screen on medium contain keratin as the only carbon source

I'd not offer feathers as the sole source of carbon.   This presents a pretty substantial hurdle to growth even for constitutive producers of keratinase.  Here's a medium that might be useful. 

http://www.ncbi.nlm.nih.gov/pubmed/14871173

Dear Rama,

You might like to check out the attached publications:

Regards

@ Ghada Abd-Elmonsef Mahmoud  Thanks for your information

@Phil Geis: your  medium s useful for me, thanking you.

Dear Professor Mohammed saleem Ali-shtayeh:

Thanking for your most valuable information for my research. i am a beginner of that research tats why i faced  lot of troubles.