The evolution and future of American animal agriculture.
D000822:Animal Husbandry / Q000266:history* / Q000379:methods; D000818:Animals; D002417:Cattle; D004493:Education; D005544:Forecasting; D005823:Genetics; D049672:History, 19th Century; D049673:History, 20th Century; D007315:Insemination, Artificial; D009747:Nutritional Physiological Phenomena; D014481:United States