EN
A karyotpe analysis of 565 pedigree beef cattle was carried out as part of cytogenetic studies conducted at the Department of Immuno- and Cytogenetics of the National Research Institute of Animal Production.Using CBG-, GTG- and RBA- binding techniques, 16 cases of the 1;29 Robertsonian translocation were diagnosed in the Charolais breed (two bulls) and hybrids from the Blonde d' Aquitane bulls (4 bulls and 10 heifers).A homozygous form of translocation was identifiedin one heifer.A testicular biopsy and meiotic chromosome analysis were carried out in a bull-carrier of the 1;29 translocation .The presence of a trivalent, characteristic of a centric fusion, was observed.The population under study also showed XX/XY leucocytic chimerism in two young bulls.