How do they domesticate the guinea fowl?

Answer 1

Their breast muscles are dark, enabling them to sustain themselves in flight for considerable distances if hard-pressed. Grass and bush fires are a constant threat and flight is the most effective escape.

Some species, like the vulturine, may go without drinking water for extended periods, instead sourcing their moisture from their food. Young guineafowl are very sensitive to weather, in particular cold temperatures.

Their beaks are aadpted for their seed-eating diet.

Answer 2

Technically guinea fowl are already domesticated, you don't usually get guinea fowl from the wild into your ownership and care. They are easily tamed.