Utah State University Extension
Beef cattle raised in the western United States spend the majority of their life on rangeland or pasture, eating grasses and forbs, followed by three to four months in a feedlot eating a combination of grain and hay to reach target weight (Norwak 1991).
Curtis, Kynda; Ma, Zhao; MacAdam, Jennifer; and Chakreeyarat, Voravee, "Rancher Adoption Potential of the Birdsfoot Trefoil Pasture Beef Production System in the Intermountain West" (2012). All Current Publications. Paper 1372.