Bitgood J J, Eutsler E P, Wallace M P
Poult Sci. 1987 Jan;66(1):166-7. doi: 10.3382/ps.0660166.
During a study to determine if any genetic linkage existed between the chicken mutations pirouette and naked neck, it was found that when both traits are expressed simultaneously in an individual, an "automutilation" condition can be created in some cases. The tremulous head movements of naked neck-pirouette chicks cause scraping of the skin on the neck against the egg shell during hatching, resulting in lacerations of the neck in varying degrees. Because of this potential for injury, it is suggested that matings between carriers of tremulous neurological disorders and carriers of mutations that result in lack of down cover be avoided whenever possible.
在一项确定鸡的“脚尖旋转”和“裸颈”突变之间是否存在任何基因连锁的研究中，发现当这两种性状在一个个体中同时表达时，在某些情况下会产生一种“自残”状况。裸颈 - 脚尖旋转雏鸡颤抖的头部运动导致孵化期间颈部皮肤在蛋壳上摩擦，从而造成颈部不同程度的撕裂伤。鉴于这种受伤的可能性，建议尽可能避免患有颤抖性神经疾病的携带者与导致绒毛覆盖缺失的突变携带者之间进行交配。
