leptin gene markers, carcass traits, beef cattle, genetic backgrounds
The objective of this study was to evaluate four genetic markers on the leptin gene for association with carcass traits in three crossbred families. Three half-sib families were developed from crossbred sires. Families 1, 2, and 3 comprised 26, 21, and 66 offspring, respectively (n = 113). 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, Yield Grade, and percent kidney, pelvic, and heart fat (KPH). The four markers analyzed were located on the exon 2, exon 3, and promoter region of the leptin gene. There was an association of marbling score with leptin exon 3 (P < 0.05), and ability to grade choice with leptin exon 2 (P < 0.05), exon 3 (P < 0.001), and promoter (P < 0.01) in family 2. Family 2 also displayed allelic effects for ability to grade choice (P < 0.01) with leptin exon 3 and promoter. Family 3 showed an association between leptin exon 2 (P < 0.05) and marbling score. No association was detected (P > 0.05) on family 1.
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South Dakota State University
Copyright © 2006 South Dakota State University
Sanborn, Angela M.; Rosa, Artur J.M.; Linblom, Stacy J.; and Taylor, Anna R., "Association of Leptin Gene Markers with Carcass Traits in Beef Cattle" (2006). South Dakota Beef Report, 2006. 6.