Black white Vietnam H'mong 

Hmong chickens are a land-race chickens raised primarily by the Hmong hill tribes of East Asia and South East Asia. The Hmong chickens are a fibro-melanistic breed of chicken.These birds tend to have an upright body, tight feathering, mulberry to dark skin, pea combs or straight comb. they also should have the ability to be broody and being fierce mothers. Their meat is flavorful and the best parts is arguably the dark meats, they make a great soup bird which their human counterparts have made with for generations. Of course it is a black meat breed hence the fibromelanistic title they are given but don't be alrmed if they aren't super mega dark. In the white Hmong dialect "qaib xiav nqaij" means blue skinned chicken, Green Hmong dialect often calls them "qab xav nkaaj" meaning blue indigo chickens.
There are just three other chicken breeds—ayam cemani, Vietnam’s H’Mong and the Silkie—share the Cemani’s “internal blackness,” a condition which is known in scientific parlance as fibromelanosis, or dermal hyperpigmentation.

H'mong chicken is a dual-purpose breed, producing an amount of thigh meat 1.3 times greater than breast meat. The proportion of iron in Hmong chicken meat is higher than that in other domestic chicken breeds and there are eight unsubstituted amino acids in the meat. That's makes them very valuable.