> To use numbers, a dry ferret diet should contain at least 30 – 40 % crude protein and 15 –20% fat. The protein should be of animal origin and highly digestible.

(I would guess that 'highly digestible' means raw - but i'm not terribly sure).

That was from following a link on the second site.

It mentioned that raw egg was suitable as a treat...

If they get too much fat they get chubby so then I guess you adjust the ratio. So yeah, the chicken idea sounds good.