I'm not a goose person, but I can tell you it's not a pure White Chinese, If I were to to quess, I'd say a White Chin. X Touloose (probably spelled that wrong)
It looks like an attractive chinese mix to me. The other breed is tough to determine- coudl be any number of grey/blue colored goose breeds. Pretty bird though, and the chinese geese are the most prolific layers of the geese breeds.
does it look like a female or male...when i bouth him/her i thought it was a female cause i know the chinese females have a smaller knob and also because she had a bare neck and it looked like she had been over bred but im not sure