I have tried three protocols to isolate DNA from chicken blood with one type of FTA card from Neogen, including sodium acetate+ethanol, chelex 100 resin, 100mM Tris+0.1% SDS+5 M Guanidine Thiocyanate+ethonal. But none of them worked. I guess the FTA card I am working on is not the elute cards which should be easy to work with. But the company technical support is hard to reach. Could anyone give me some tips? Thank you very much.