This is an interesting article. I'll put the link to the entire article below.
"High-quality carcasses start with high-starch diets and high-starch diets need to begin with calves as early as possible. Research shows calves that are fed high-starch diets early in life will have more marbling at the same backfat end point than calves grown on forages. In addition, the amount of starch in the finishing diet is not as critical as starch at a young age. Research also confirms it is more important than genetic merit for marbling."
http://www.angusjournal.com/articlePDF/ ... itical.pdf
"High-quality carcasses start with high-starch diets and high-starch diets need to begin with calves as early as possible. Research shows calves that are fed high-starch diets early in life will have more marbling at the same backfat end point than calves grown on forages. In addition, the amount of starch in the finishing diet is not as critical as starch at a young age. Research also confirms it is more important than genetic merit for marbling."
http://www.angusjournal.com/articlePDF/ ... itical.pdf