(1) Yorkshire Pig is large, well-proportioned, with a white coat, a few black spots on the forehead, a slightly concave face, large and upright ears, a straight nose, a slightly arched back and waist, a plump and compact abdomen and long limbs. At the age of 6 months, the body weight can reach about 100 kg. When the weight is 90 kg, the slaughter rate is 7 1% ~ 73%, and the eye muscle area is 30 ~ 37 cm 2. Carcass lean meat rate is 60% ~ 65%. Large white pigs are often used as male parents to cross with local pig breeds to produce hybrid commercial pigs.
(2) The long white pig head is small and handsome, with a straight face, big ears leaning forward, a streamlined body with a narrow front and a wide back, full thighs and the whole hindquarters, thin skin and strong bones, and a thick white coat. At the age of 6 months, the body weight can reach more than 90 kg. When the body weight is 90 kg, the slaughter rate is 69% ~ 75% and the carcass lean meat rate is 53% ~ 65%. Landrace pigs are often used as parents to cross two or three breeds in production.
(3) Duroc pig's coat is golden yellow or brownish red, with different shades, medium-sized ears, drooping ears, slightly concave face, small and delicate head, deep and wide body, wide and deep chest, plump hindquarters and stout limbs. At the age of 6 months, the body weight can reach 90 kg. When the body weight 100 kg, the slaughter rate is 75%, the carcass lean meat rate is 6 1%, the back fat thickness is 2.69 cm, and the eye muscle area is 37 cm2. Duroc pig is often used as the male parent in production, which makes two breeds cross with local pig breeds.
(4) Humpback pig has a long body, arched back, medium-sized head, erect ears, long and straight mouth, muscular hindquarters, prominent coat color characteristics, black hair on the head, middle and hindquarters, white belt at the junction of shoulders and necks, and gray with black skin and white hair on the black and white edges. Six months old can reach 90 kilograms. Slaughtered when the body weight is 90kg, the slaughter rate is 7 1% ~ 75%, the eye muscle area is more than 30 cm2, and the carcass lean meat rate is more than 60%. Usually used as a male parent in hybrid utilization.
(5) Pitland pig is of medium build, with cylindrical body, abdomen parallel to the back, handsome head, straight face, large and straight mouth, medium ears, slightly leaning forward, short neck and limbs, straight and wide back, and well-developed muscles in shoulders and buttocks. At the age of 6 months, the body weight can reach 90 ~ 100 kg. The slaughter rate is 76% and the lean meat rate can reach 70%. In production, it is often used as a binary or ternary hybrid male parent.