Why pigs have so many nipples?

Sows tend to have a large litter of piglets to feed (ranging from 8 to 18 piglets), so a large number of teats are needed to feed as many piglets as a sow has. Sows only have one uterus, but have two long uterine horns which are able to house as many offspring as she can. The uterine horns are designed by nature so that they can have each fetus with their own placenta to live and grow from. Pigs are an ideal meat animal because of their high offspring numbers, their length of gestation, and their ability to grow quickly and efficiently.