羽步并退左转步与滑轴步。
根据传统理论，鳞片变成羽毛的第一步是先拉长，接著长出流苏般的边缘，最后产生有小钩与沟槽的羽小枝。
According to this scenario, scales became feathers by first elongating, then growing fringed edges, and finally producing hooked and grooved barbules.
为进一步研究半番鸭羽色MC1R基因SNP标记及在品系选育中的应用奠定了基础；
This is the basic information for further study on plumage color MC1R gene SNP markers of mule duck in the screening and selection of duck lines.
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