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.The presence of an XY/XYY karyotype appears to be extremely rare in any mammal. With the exception of cases in man (Melnyk et al. 1969 ;Jacobs et al. 1974;Hamerton et al. 1975), only two cases have been reported in a Bulgarian Brown cattle (Dobryanov and Konstantinov 1970) and a Siamesecrossbred cat (Loughman and Frye 1974). The XY/XYY individuals had a normal male conformation and no physical abnormalities, but histopathologic examination of the testicular tissue revealed the absence of germinal cell stages in the cat. Also, the XYY condition in man (Zeuthen et al. 1973;Skakkebaek et al. 1973) and mice (Cattanach 1961; Russel and Chu 1961;Evans et al. 1978) is frequently associated with reduced fertility. This paper presents additional evidence on a 60, XY/61, XYY karyotype detected in a Japanese Black cattle.Case history : To test the performance of meat production of the Japanese Black bull A, eight half-sib male offsprings were randomly selected from the progeny population sired by the bull A. They were castrated at about six months of age. After the completion of the progeny test conducted for 52 weeks, all offsprings were slaughtered to evaluate their growth rate, feed efficiency and carcase quality. A few days prior to slaughter, cytogenetic survey was performed on the bull A and his offsprings. The present case was one of these offsprings.Cytogenetic studies : Blood samples were taken from the jugular vein in

Y-Chromosome Disomy and Trisomy in Scarabaeid and Cerambycid Beetles

“…This confirms the correct segregation at anaphase I. In mammals from either breeding or the wild, it is noticeable that Y disomies are frequently mosaics: X/XYY, XY/XYY or X/XY/XYY [Evans et al, 1969;Hanada and Muramatsu, 1981;Searle and Wilkinson, 1986;Quilter et al, 2003]. In beetles, about one third of disomies Y are mosaics (Xy p /Xyy p ) [calculated from Smith and Virkki, 1978;Petitpierre et al, 1988;de Julio et al, 2010, and this study], but at difference with mammals, there is no clone without a Y chromosome.…”

Recent Results in Cattle Cytogenetics – A Review

“…Japanese Black bull mosaic XY/XYY had a normal male conformation and no physical abnormalities. Another mosaic carrier in Holstein-Friesian breed had left scrotum in a state of hypoplasia (Hanada, Muramatsu, 1981;Miyake et ah, 1981).…”