ALIGNMENT OF THE PIGMAP AND USDA LINKAGE MAPS OF PORCINE CHROMOSOME-3AND CHROMOSOME-9

The European Pig Gene Mapping Project (PiGMaP) and United States Depar tment of Agriculture (USDA) porcine linkage maps for chromosomes 3 and 9 have been aligned by typing three USDA microsatellites from chromos ome 3 and five from chromosome 9 on the PiGMaP reference families. Usi ng the CRIMAP linkage analysis package, revised multipoint linkage map s were constructed for chromosome 3 and 9. Inclusion of these USDA mar kers in the multipoint analysis resulted in an increase in length of 4 7% and 33% respectively for these two PiGMaP linkage groups. This incr ease in size is mainly the result of extension of the ends of both lin kage groups.