The term 'breed of pig' can refer to two specific breeds: WELSH and Duroc. The WELSH breed is a small, white pig with erect ears that originated in Wales. It is known for its hardiness and adaptability to different climates. The Duroc breed is a large, reddish-brown pig with drooping ears that originated in the United States. It is known for its high quality meat and good temperament. Both breeds are popular for their meat production and are used in many countries around the world.