709
Genomic-polygenic evaluation of multibreed Angus-Brahman cattle for postweaning ultrasound and weight traits with actual and imputed Illumina50k SNP genotypes

Monday, August 18, 2014
Posters (The Westin Bayshore)
Mauricio A. Elzo , Department of Animal Sciences, University of Florida, Gainesville, FL
Milton G. Thomas , Colorado State University, Department of Animal Sciences, Fort Collins, CO
D. Dwain Johnson , University of Florida, Gainesville, FL
Carlos A. Martinez , Department of Animal Sciences, University of Florida, Gainesville, FL
Graham C. Lamb , University of Florida, Marianna, FL
D. Owen Rae , University of Florida, Gainesville, FL
Jerry D. Wasdin , University of Florida, Gainesville, FL
Joseph D. Driver , University of Florida, Gainesville, FL
Abstract Text: Additive genomic to total genetic variance fractions (VAGO/VGTOT) for postweaning ultrasound traits explained by 46,909 actual-imputed Illumina50k SNP genotypes were 0.17 for ribeye area (UREA), 0.32 for fat thickness (UFAT), 0.25 for percent intramuscular fat (UPIMF), and 0.19 for weight (UW) in multibreed Angus-Brahman cattle.  Heritabilities were 0.33 for UREA, 0.22 for UBF, 0.43 for UPIMF, and 0.54 for UW.  The VAGO/VGTOT ratios were 1.8, 1.0, 4.4, and 2.1 times whereas heritabilities were 1.0, 1.2, 1.0, and 1.2 times those obtained for these traits with 2,899 Illumina3k SNP.  Rank correlations between genomic-polygenic and polygenic EBV were the highest (0.93 to 0.96), followed by those between genomic-polygenic and genomic EBV (0.81 to 0.94), and by those between genomic and polygenic EBV (0.66 to 0.81).  Regressions of EVB on Brahman fraction were low for all models and traits suggesting that all breed groups had animals of comparable EBV.

Keywords: Beef; Imputation; Ultrasound

See more of: Posters: Beef Cattle Breeding (Group 1)
See more of: Species Breeding: Beef cattle
Previous Abstract | Next Abstract >>