Group Housing Systems for Pregnant Sows

Gilt Selection - Gilts, or female pigs that have not had a litter of piglets, are housed in groups are chosen at about 32 weeks old to be bread based on various traits, including observable characteristics and reproductive potential.

Breeding and Pregnancy Confirmation
Female pigs are artificially inseminated and housed in individual stalls for about six weeks until confirmed pregnant by ultrasound. 

Once confirmed pregnant, female pigs are housed in groups until they are ready to farrow, about 16 weeks after being bred. 

Farrowing and Nursing
Pregnant gilts and sows are moved into individual farrowing stalls where they farrow a litter of piglets and then nurse the litter until they are weaned, three to four weeks after farrowing.