EN
Fluorescence in situ hybridization (FISH) experiments with specific probes for chromosome 29 and 25 were carried out on a Brown Swiss bull, previously diagnosed as a carrier of 1;29 centric fusion. The hybridization of the chromosome 29-specific probe (BMC 4216 - already located on 29q13), produced signals on two small acrocentrics, but not on the translocated chromosome. The signals appeared on the translocated chromosome and on a single chromosome 25 after hybridization of the chromosome-specific probe (BMC 3224 - previously located on 25q24). According to the actual nomenclature, the analysed aberration is a robertsonian translocation involving chromosomes 1 and 25.