There are five dominant plumage color mutations, such as yellow, silver, white, black at hatch and light down are lethal or semi-lethal in the homozygous state.

• 有5个基因座的显性羽色突变基因如黄羽、银色羽、白羽、孵化黑羽和亮绒羽在纯合状态下具有致死或半致死效应。