A phenotypically normal cattle with 60, XY/61, XYY karyotype

Abstract

Cytogenetic examination was performed on a Japanese Black bull and his eight offsprings. Out of nine cattle examined, eight animals showed normal male karyotype with 60, XY. However, one offspring had a normal male cell line (60, XY) and a cell line characterized by the karyotype (61, XYY). The frequencies of cells with XY and XYY sex chromosome complements were 76.5% and 23.5%, respectively. This animal had a normal male conformation and no physical abnormalities were detected.