Heart disease, or cardiovascular disease, is a general name for a wide variety of diseases, disorders and conditions that affect the heart and blood vessels. Heart disease is the number one cause of death in the United States, according to the Centers for Disease Control and Prevention (Source: CDC).
Mostly sheep eat grass, clover, forbs, and other pasture plants. They especially love forbs. In fact, it is usually their first choice of food in a pasture. A forb is a broad-leaf plant other than grass. It is a flowering plant. Forbs are often very nutritious.
It is not unnatural for sheep to eat grain. They have always eaten the seeds of plants. A protein source, such as soybean meal or cottonseed meal is usually added to the grain ration, along with vitamins and minerals to make a 100 percent nutritionally-balanced feed.