ABSTRACT. In this chapter, the information provided by new DNA technologies and the use of genomics in both GWAS and GS are described in detail. Because the use of genomic information in beef breeding programmes shows its potential in improving the quality of beef, the current use of GS in beef cattle is discussed. The progress on the genomics applied to the genetic improvement of beef quality is presented here, as well as research findings for marbling, fatty acids profile and tenderness. The benefits of building large training populations and the alternatives to this, are also discussed.