Nutritionpost, the Old Testament rules, followed today by Jews who observe kosher laws, allow eating of animals which BOTH chew cud and have a cloven hoof. That includes sheep and beef cattle (lamb and veal, of course, too) among others. Pigs have a cloven hoof, but don't chew cud; therefore, they're forbidden. That also leaves out horses. Some scholars say this is because those who don't browse on grass may eat garbage, spreading disease; others have other opinions- I believe it has to do with disease and spoilage. (Bottom-feeding fish/shellfish, which can cause deadly poisoning from fast spoilage, are also prohibited, but that's another topic.) Eating of meat isn't at all prohibited in the Torah (Old Testament).