|Sexten, Andrea -|
Submitted to: Annual International Plant & Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: December 1, 2010
Publication Date: January 1, 2011
Citation: Lindholm-Perry, A.K., Sexten, A.K., Kuehn, L.A., Smith, T.P., King, D.A., Shackelford, S.D., Wheeler, T.L., Snelling, W.M., Freetly, H.C. 2011. The effects of genetic markers on BTA6 significant for steer feed intake and gain traits on carcass and meat traits. Plant & Animal Genome XIX Conference. Poster No. P531. p. 230 Technical Abstract: Genetic selection for animals that require less feed while still achieving acceptable levels of production could result in substantial cost savings for cattle producers. We have identified DNA markers on bovine chromosome 6 located between 38.16 - 38.38 Mb that were significant for both feed intake and average daily gain in a 7-breed advanced cross steer population (n=1139). These SNP are located within and between the genes NCAPG and LOC540095 (bovine ortholog of LCORL). Polymorphisms in LCORL have been associated with human skeletal frame size and SNP in NCAPG have been associated with cattle growth. The purpose of this study was to determine whether the significant markers for feed intake and growth in our population of animals adversely affected steer carcass traits. The eight most significant markers for dry matter intake and average daily gain were analyzed with carcass traits, including hot carcass weight (HCW), yield grade (YG), marbling score (MB), longissimus muscle area (LMA), adjusted fat thickness (AFT), lean color (LC), lean texture (LT), lean firmness (LF), slice shear force (SSF) and Warner Bratzler shear force (WBS). We discovered that markers significant (P<0.0002) for higher dry matter intake and higher average daily gain were also significant for higher HCW (P</=5x10-8), lower YG (P</=1x10-4), higher LMA (P</=3x10-8), lower AFT (P</=2x10-5)and higher LT (P</=0.05), while LC, LF, MB and tenderness were unaffected. The alleles that correspond to higher feed intake and increased gain are associated with increased lean growth (0.08-0.09 YG) and reduced fat deposition (0.28–0.32cm AFT).