A comparative mapping approach was applied in order to refine the extent and the distribution of conserved segments between the long arm of human chromosome 10 (HSA10) and cattle chromosomes 26 and 28 (BTA26 and BTA28 respectively). Sixteen genes localised on the long arm of HSA10 were mapped using a bovine-hamster somatic cell hybrid panel: twelve represent new assignments in cattle; the four others are in agreement with previous published data. This study confirms and refines the boundaries of the disruption zones between HSA10 and, BTA26 and BTA28, at the level of the human cytogenetic band.