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A pericentric inversion of chromosome 4 in a boar, as well as a case of (2q-;5p+)translocation mosaicism in a bull were analysed by chromosome painting using probes generated\udby conventional microdissection. For the porcine inversion, probes specic for p arms and q arms were produced and hybridised simultaneously on metaphases of a heterozygote carrier. In the case of the bovine translocation, two whole chromosome probes (chromosome 5, and derived chromosome 5) were elaborated and hybridised independently on chromosomal preparations of the bull who was a carrier of the mosaic translocation. The impossibility of differentiating chromosomes 2 and der(2) from other chromosomes of the metaphases did not allow the production of painting probes for these chromosomes. For all experiments, the quality of painting was comparable to that usually observed with probes obtained from ow-sorted chromosomes. The results obtained allowed conrmation of the interpretations proposed with G-banding karyotype analyses. In the bovine case, however, the reciprocity of the translocation could not be proven. The results presented in this paper show the usefulness of the microdissection technique for characterising chromosomal rearrangements in species for which commercial probes are not available. They also conrmed that the main limiting factor of the technique is the quality of the chromosomal preparations, which does not allow the identication of target chromosomes or chromosome fragments in all cases

Chromosomal rearrangements in�cattle and�pigs revealed by�chromosome microdissection and�chromosome painting