in the United States. Each pregnancy lasts for three months, three weeks, and three days. Sows will have an average of 2.5 litters every year for two or three years, most of which is spent in the crates. They give birth to between five and eight litters before being slaughtered. Some older sows may reach a size at which they have to sleep on their chests, unable to lie on their sides as pigs usually do. The floors are slatted to allow excrement and other waste to fall into a pit below.

Birth