Since 1985 there has been a gradual reduction in farrowing rates in many herds associated with increased repeats in sows. A discharge from the vulva post-service does not automatically mean there has been a pregnancy failure, but it will in most cases indicate infection.
Discharges can arise from the rectum, the vulva, the vagina, the cervix and the uterus.
It is important to record the time when discharges are first seen, their colour and composition and effects on the sow. Vulval discharges are common within 3-4 days of farrowing when a thick viscous material may be excreted. If the sow is healthy, the udder is normal and there is no mastitis, ignore it. A heavy smelling bloody discharge may indicate a retained piglet or afterbirth. The lips of the vulva of each sow should be parted daily and any tackiness or small discharge noted.