Pig housing: recent trends and problems.
D000383:Agriculture; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001522:Behavior, Animal; D003441:Crowding; D006798:Housing; D006801:Humans; D012722:Sewage; D013315:Stress, Psychological; D013552:Swine; D013553:Swine Diseases / Q000517:prevention & control
D012722:Sewage