| Autor: |
Peters SO; Department of Animal Science, Berry College, Mount Berry, GA 30149, USA., Kızılkaya K; Department of Animal Science, Faculty of Agriculture, Aydin Adnan Menderes University, Aydin 09100, Turkey., Sinecen M; Department of Computer Engineering, Faculty of Engineering, Aydin Adnan Menderes University, Aydin 09100, Turkey., Mestav B; Department of Statistics, Faculty of Arts and Sciences, Çanakkale Onsekiz Mart University, Terzioğlu Campus, Çanakkale 17100, Turkey., Thiruvenkadan AK; Department of Animal Genetics and Breeding, Veterinary College and Research Institute, Tamil Nadu Veterinary and Animal Sciences University, Salem 637002, Tamil Nadu, India., Thomas MG; Texas A&M AgriLife Research, Beeville, TX 78102, USA. |
| Abstrakt: |
The predictive abilities and accuracies of genomic best linear unbiased prediction (GBLUP) and the Bayesian (BayesA, BayesB, BayesC and Lasso) genomic selection (GS) methods for economically important growth (birth, weaning, and yearling weights) and carcass (depth of rib fat, apercent intramuscular fat and longissimus muscle area) traits were characterized by estimating the linkage disequilibrium (LD) structure in Brangus heifers using single nucleotide polymorphisms (SNP) markers. Sharp declines in LD were observed as distance among SNP markers increased. The application of the GBLUP and the Bayesian methods to obtain the GEBV for growth and carcass traits within k-means and random clusters showed that k-means and random clustering had quite similar heritability estimates, but the Bayesian methods resulted in the lower estimates of heritability between 0.06 and 0.21 for growth and carcass traits compared with those between 0.21 and 0.35 from the GBLUP methodologies. Although the prediction ability of the GBLUP and the Bayesian methods were quite similar for growth and carcass traits, the Bayesian methods overestimated the accuracies of GEBV because of the lower estimates of heritability of growth and carcass traits. However, GBLUP resulted in accuracy of GEBV for growth and carcass traits that parallels previous reports. |
