What are the basic requirements for pig barn construction?

First, the pig barn area must have a breeding boar barn (including a replacement boar barn), a bred-but-not-yet-pregnant sow barn (including a replacement sow barn), a pregnant sow barn, a farrowing and lactating sow barn, a nursery pig barn, a finishing pig barn, and a loading and unloading ramp for pigs. Pig farms that carry out artificial insemination must have a semen processing room and a breeding room. Second, the pig barns must be equipped with automatic drinkers, and the water source and water quality must comply with the provisions of the standards. Third, the breeding boar barn, bred-but-not-yet-pregnant sow barn and pregnant sow barn must be equipped with ventilation, cooling and heating facilities that meet breeding requirements. Fourth, the farrowing and lactating sow barn and the nursery pig barn must be installed with different forms of electrical and mechanical facilities for ventilation, heating or cooling, and at the same time have supporting facilities for high-bed rearing that achieve a high barn utilization rate and high labor efficiency. Fifth, all types of pig barns must have suitable environmental conditions and a scientific and reasonable rearing density.