Tens of millions of farm animals cross state lines every year, traveling in cramped, stressful conditions that can facilitate the spread of disease.Tens of millions of farm animals cross state lines every year, traveling in cramped, stressful conditions that can facilitate the spread of disease.Read Moreyour-feed-science, your-feed-health, your-feed-animals, Animals, Livestock, Avian Influenza, Law and Legislation, Animal Abuse, Rights and Welfare, Food Contamination and Poisoning, Bacteria, Agriculture and Farming, Factory Farming, Pigs, Antibiotics, Meatpacking Plants and Slaughterhouses, Chickens, Swine Influenza, Cattle, Respiratory DiseasesNYT > Health