Shanghai White Pig

Shanghai White Pig

　　Bred in the suburban counties of Shanghai, the Shanghai White Pig is primarily developed from Yorkshire pigs, Suzhong White pigs, and Taihu pigs. There are currently 20,000 productive sows.

　　 (1) Breed Characteristics: The pig has white hair all over, a medium to large body size, a sturdy physique, a straight or slightly concave face, and medium-sized ears that tilt slightly forward. It has a broad back, moderately large belly, and well-developed hindquarters. Adult boars weigh over 250 kilograms, with a body length of about 167 cm, while sows weigh around 177 kilograms and measure about 150 cm in length.

　　 (2) Fattening Performance: By 8–9 months of age, pigs reach a weight of over 100 kilograms, gaining approximately 615 grams per day. The feed-to-meat ratio is 3.62:1. When slaughtered at 90 kilograms, the average dressing percentage is 70%, with an average lean meat percentage of 52.5% in the carcass, an eye muscle area of 26 square centimeters, and a leg-to-hindquarter ratio of 27%.

　　 (3) Reproductive Performance: Shanghai White boars usually begin mating at 8–9 months of age when they weigh over 100 kilograms. Sows enter their first estrus at 6–7 months of age, with an estrous cycle of 19–23 days and an estrus duration of 2–3 days. Most sows are bred at 8–9 months old. First-litter sows produce around 9 piglets, while sows with three or more litters produce 11–13 piglets. There are typically 6–7 pairs of teats, and weaned piglets weigh about 15 kilograms at 60 days old.

　　 (4) Main Characteristics: Fast growth, high litter size, strong adaptability, and high lean meat percentage in the carcass.