Sow lactation is affected by factors such as season, breed, and disease

Seasonal factors affecting sow lactation: in spring and autumn, the weather is mild and cool, there is plenty of green feed, the sow has a strong appetite, and its milk yield is also high; in the severe cold of winter, the sow consumes more body heat and produces less milk. When a sow comes into estrus during lactation, it often affects the quality and quantity of milk, and at the same time easily causes white scour in piglets; in sows with a higher milk yield, lactation will suppress estrus. Milk yield varies with sow breed. The lactation capacity of Landrace pigs and their crossbred sows is significantly higher than that of medium Yorkshire and Berkshire pigs and their crossbred sows. If a sow becomes ill during lactation, such as with a cold, mastitis, pneumonia and other diseases, milk yield can decrease.