What are the main benefits of developing lean-type pigs?

Lean-type pigs refer to two-breed or three-breed crossbred pigs that can fully exploit hybrid vigor. Developing lean-type pig production can yield relatively high economic returns and is the main direction of current and future commercial pig production. First, they have large litters and high survival rates, with an average of 1 to 1.5 more piglets weaned per litter, and weaning litter weight increased by 30 to 40%. Second, they have fast growth rates and high feed conversion, which can be improved by 20% to 30%. Third, they have high lean meat rates, with carcass lean meat rates above 55%.