The karyotype of theMuscovy duck originating from Cairina moschata was characterised on the basis of R and C bands. Chromosomal preparations obtained from an in vitro blood lymphocyte culture were RBG- and CBG-stained. The structures of nine and fourteen pairs of chromosomes were examined based on R bands and C bands, respectively. Ideograms of banded patterns of the analysed chromosomes were drawn. The sizes of individual constitutive heterochromatin blocks wereas measured. The morphology of the analysed chromosomes was assessed.