One of the most common reasons for poor litter size is inseminating the sow too early in the heat period. Proper timing requires twice daily checking for heat. Heat checks should be done in the presence of a boar, who will make the sow show stronger signs of heat. Can sit on sow's back without her objecting Redness inside vulva is waning Mucus inside vulva is changing from clear and watery to opaque and sticky. Check for heat 24 hours after the second insemination, if the sow is still in heat then she was inseminated too early.
Most catheters have tips shaped more or less like the tip of a boar's penis.
Disposable plastic or reusable rubber catheters are available from commercial AI stations. Stimulate the sow until she stands without moving. Having a boar within sight makes this easier. Gently wipe clean the sow's vulva with a damp paper towel. Gently pass the catheter through the vulva and into.