title: Beef Species Symposium: nutrient requirements of the beef female in extensive grazing systems--considerations for revising the Beef NRC.
authors.affiliation: Department of Animal Sciences, Colorado State University, Fort Collins 80523 jack.whittier@colostate.edu.
authors.forename: J C
authors.initials: JC
authors.lastname: Whittier
mesh_terms: D000822:Animal Husbandry / Q000379:methods / Q000592:standards*; D000818:Animals; D002417:Cattle / Q000254:growth & development / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology; D005260:Female; D009747:Nutritional Physiological Phenomena / Q000502:physiology; D009751:Nutritional Requirements / Q000502:physiology*