Submitted to: American Society of Animal Science Annual Meeting
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/28/2006
Publication Date: 7/9/2006
Citation: Sanborn, A.M., Casas, E., Rosa, A.J. 2006. Association of microsatellite markers on bovine chromosomes 5 and 6 with carcass traits [abstract]. Journal of Animal Science. 84(Suppl. 1):447. Abstract #626.
Technical Abstract: The objective was to identify chromosomal regions associated with phenotypic variation in carcass traits in three crossbred families. Three half-sib families were developed from crossbred sires. Families 1, 2, and 3 comprised 29, 25, and 77 offspring, respectively (N=131). The genetic background of the sires, dams, and offspring was 1/3 Angus, 1/3 Hereford, 1/3 Simmental. Animals were housed at the South Dakota State University Beef Breeding Unit, Brookings, SD. Calves were born between 2001 and 2004. Carcass traits collected were finished weight, hot carcass weight, marbling score, and longissimus muscle area. Microsatellite markers on chromosomes 5 and 6 were selected based on their relative position. Markers used on chromosome 5 were BM6026, RM103, BM321, RM084, BMS1216, BM315, and BM597. Markers used on chromosome 6 were ILSTS093, ILSTS090, BM1329, BMS518, ILSTS035, BM8124, and BMC4203. Individual marker analysis was conducted because homozygosity of the bulls for some markers hindered interval mapping. Family 1 exhibited allelic affects for finished weight, hot carcass weight, and marbling score on chromosome 5. Markers RM103 and BM321 were associated with finished (P<0.01) and carcass (P<0.05) weights. An association with marbling score was identified with BM6026 (P<0.05), RM103 (P<0.01), and BM321 (P<0.01). On chromosome 6, BMC4203 was associated with longissimus muscle area in family 1 (P<0.05) and family 2 (P<0.001). No association was detected (P>0.05) on family 3. Association of these markers with carcass traits on chromosomes 5 and 6 are consistent with findings from independent studies.