Somes R G, Pabilonia M S
J Hered. 1981 Mar-Apr;72(2):121-4. doi: 10.1093/oxfordjournals.jhered.a109439.
The lethal effects of the ear-tuft trait of the Araucana chicken are reported and the genetic basis of its inheritance is verified. The ear-tuft (Et) gene acts as an autosomal dominant with reduced penetrance in heterozygotes. This study gave two estimates of reduced penetrance, 4 and 14 percent. Homozygotes die during 17-19 days of incubation, although a few may hatch. Most of these die within a week, but occasionally an "escaper" will live to maturity; one such Et/Et individual was verified. Heterozygotes also experience increased embryonic mortality at about 20 or 21 days of incubation. In this study the average embryonic mortality among heterozygotes was 41.6 percent. Posthatch mortality also was significantly greater among tufted chicks than among nontufted chicks.
报道了阿劳卡纳鸡耳簇性状的致死效应，并验证了其遗传的遗传基础。耳簇（Et）基因作为常染色体显性基因，在杂合子中的外显率降低。本研究给出了两个外显率降低的估计值，分别为4%和14%。纯合子在孵化17 - 19天期间死亡，尽管有少数可能孵化出来。其中大多数在一周内死亡，但偶尔会有一只“逃脱者”活到成年；已证实有一只这样的Et/Et个体。杂合子在孵化约20或21天时也会经历胚胎死亡率增加的情况。在本研究中，杂合子的平均胚胎死亡率为41.6%。有耳簇雏鸡的孵化后死亡率也显著高于无耳簇雏鸡。
