在对18头不育小母牛进行的细胞遗传学研究中观察到XY雌性、单胎双胎之一的雌性不育犊牛和三体（61, XX, +20）的病例。
Cases of XY female, single-birth freemartin and trisomy (61, XX, +20) observed in cytogenetical studies on 18 sterile heifers.
作者信息
Murakami R, Miyake Y, Kaneda Y
出版信息
Nihon Juigaku Zasshi. 1989 Oct;51(5):941-5. doi: 10.1292/jvms1939.51.941.
PMID:2607745
Abstract
A total of 18 sterile heifers, their mother cows, their half-sib cows and a bull which may or may not be a full-sib were cytogenetically investigated. Three cases out of the 18 sterile heifers showed different types of chromosomal abnormalities respectively; 60, XY; 60, XX/60, XY; 61, XX, +20. The remainder showed normal karyotype.
摘要
对总共18头不育小母牛、它们的母牛母亲、半同胞母牛以及一头可能是全同胞也可能不是全同胞的公牛进行了细胞遗传学研究。18头不育小母牛中有3例分别表现出不同类型的染色体异常；60，XY；60，XX/60，XY；61，XX，+20。其余的表现出正常核型。
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