A chromosomal polymorphism was detected on karyological screening of Kangayam breeding sires prior to subjecting them for frozen semen collection. One bull possessed the chromosomal complement 2n = 60, consisting of 58 acrocentric autosomes, one large sub-metacentric X-chromosome, and one small acrocentric Y-chromosome with a small visible p-arm, which was further confirmed using CBG- and GTG-banding. This polymorphism was attributed to a heterochromatin variation of the acrocentric Y-chromosome routine in the Bos indicus Linnaeus, 1758 cattle.

中文翻译：

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印度南部康雅亚姆公牛（Bos indicus）的一种罕见染色体多态性

 在对 Kangayam 种公牛进行冷冻精液采集之前，对其进行核型筛查时检测到了染色体多态性。一头公牛拥有染色体补体 2n = 60，由 58 个顶着丝粒常染色体、一个大的亚中着丝粒 X 染色体和一个带有可见小 p 臂的小顶着丝粒 Y 染色体组成，使用 CBG- 和 GTG- 进一步证实绑扎。这种多态性归因于 Bos indicus Linnaeus，1758 头牛的近端着丝粒 Y 染色体常规的异染色质变异。