Japanese Journal of Veterinary Research;Volume 32, Number 1

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FURTHER CHROMOSOMAL AND CLINICAL STUDIES ON THE XY/XYY MOSAIC BULL

MIYAKE, Yoh-Ichi;KANAGAWA, Hiroshi;ISHIKAWA, Tsune

Permalink : http://hdl.handle.net/2115/2305
JaLCDOI : 10.14943/jjvr.32.1.9
KEYWORDS : chromosome;XY;XYY mosaic;bull;cryptorchidism

Abstract

Cytogenetical investigation of the blood (4 times), skin (2 times), spleen and kidney was performed on a bull with unilateral cryptorchidism. This abnormal bull had two cell lines, XY cell line and XYY cell line, in all tissues examined, but the ratio with XYY cell line in the blood and skin samples became significantly lower with aging. The father bull of this case, and the 9 half-sib males and 11 daughter cows sired by the bull were cytogenetically examined. Except for one half-sib male with sex chromosomal chimerism, which was a heterosexual twin male, there was no chromosomal abnormality detected. Semen collected from this case was extremely lower in quality than that of normal bulls. Despite of lower semen quality, this case showed a similar conception rate to normal bull in Japan. From the examination of the testes obtained at the time of slaughter, the descended right testis showed severe calcinosis, and its seminiferous tubes were filled with calcareous materials. The left testis was small and did not show any spermatogenesis.

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