microsatelite markers, bovine chromosomes 5 and 6, carcass traits, chromosomal rgions
The objective of this study 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. Carcass traits collected were finished weight, hot carcass weight (HCW), marbling score, Quality Grade, Longissimus muscle area (LMA), rib fat, percent kidney pelvic, and heart fat (KPH), and Yield Grade. 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.
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South Dakota State University
Copyright © 2006 South Dakota State University
Sanborn, Angela M.; Casas, Eduardo; and Rosa, Artur J.M., "Association of Microsatellite Markers on Bovine Chromosomes 5 and 6 with Carcass Traits" (2006). South Dakota Beef Report, 2006. 7.