A.翻肛鑒別B.快慢羽鑒別C.羽色鑒別D.伴性遺傳鑒別E.外貌鑒別
A.5%~6%B.7%~8%C.9%~10%D.10%~12%E.12%~14%
A.5~7天B.10~13天C.17~18天D.19天E.21天