US grain exports and the livestock sector.
D000383:Agriculture; D000821:Animal Feed; D000818:Animals; D000829:Animals, Domestic; D003132:Commerce; D004044:Dietary Proteins; D002523:Edible Grain; D005523:Food Supply; D008460:Meat; D010940:Plant Proteins
D004044:Dietary Proteins; D010940:Plant Proteins