An average pig has 11 piglets in a litter. Pregnancy in pigs is 115 days (3 months, 3 weeks and 3 days) with a range of 110-120 days. Pigs will breed all year round, but if kept outside their fertility drops in the darker months of winter. Females have bicornuate uteruses and two conceptuses must be present in both uterine horns for pregnancy to be established.
Maternal recognition of pregnancy in pigs occurs on days 11 to 12 of the pregnancy. Domestic pigs seek out the company of other pigs, and often huddle to maintain physical contact, although they do not naturally form large herds.
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