promote the general welfare through the improved health and productivity of domestic livestock, poultry, aquatic animals, and other income-producing animals that are essential to the food supply of the United States and the welfare of producers and consumers of animal products;

improve the health of horses;

facilitate the effective treatment of, and, to the extent possible, prevent animal and poultry diseases in both domesticated and wild animals that, if not controlled, would be disastrous to the United States livestock and poultry industries and endanger the food supply of the United States;