A GENETIC-LINKAGE MAP FOR CATTLE

We report the most extensive physically anchored linkage map for cattl e produced to date. Three-hundred thirteen genetic markers ordered in 30 linkage groups, anchored to 24 autosomal chromesomes (n = 29), the X and Y chromosomes, four unanchored syntenic groups and two unassigne d linkage groups spanning 2464 chi of the bovine genome are summarized . The map also assigns 19 type I loci to specific chromosomes and/or s yntenic groups and four cosmid clones containing informative microsate llites to chromosomes 13, 25 and 29 anchoring syntenic groups U11, U7 and U8, respectively. This map provides the skeletal framework prerequ isite to development of a comprehensive genetic map for cattle and ana lysis of economic trait loci (ETL).