Do 20-day-old chickens have main feathers and auxiliary feathers?

Chickens usually start to grow feathers at fifteen days old. Feathers will grow from the wings first, usually in about 30 days, and their feathers will grow together.

Chickens are furry feathers, and patches of feathers are the main feathers. The color of the main feather will not change when it grows up, and the feathers of the main feather will be larger than those of the auxiliary feather.