How Long is a Pig Pregnant?
Sows have a gestation period of approximately 114 days, famously remembered as 3 months, 3 weeks, and 3 days. The range is typically 111 to 120 days. First-time gilts sometimes farrow a day or two earlier than experienced sows.
Pig Gestation Period Explained
The pig gestation period of 114 days is divided into early, middle, and late stages. During the early stage, fertilized eggs implant in the uterus and embryonic structures begin to form. The middle stage is characterized by rapid organ and skeletal development. In the final stage, the offspring reach near-birth size and the mother prepares instinctively for delivery by seeking a safe, quiet environment.
How to Calculate Pig Due Date
To calculate your pig's due date, simply add 114 days to the confirmed mating or conception date. This gives you the Estimated Due Date (EDD). Since births rarely fall on the exact calculated day, our calculator also shows a 5-day delivery window on either side. Use the form above to get instant results.
If your animal was bred across multiple days, enable the Date Range option. Enter the first and last breeding dates and the calculator will display both the earliest and latest possible delivery dates, giving you the complete expected birth window.
Signs of Pregnancy in Pig
Signs of pregnancy in sows include absence of return heat cycles, gradual weight gain, udder development beginning around week 12, and a noticeably rounded belly. Nesting behavior, restlessness, and milk production indicate that farrowing is imminent.
Pregnancy Stages
Month 1: Embryo implantation, a critical period during which stress must be minimized. Month 2: Rapid fetal differentiation; piglets become individually recognizable. Month 3: Growth, fat deposition, and immune transfer. Final week: Udder fills with milk; sow shows prominent nesting behavior.
Care Tips During Pig Pregnancy
Feed a balanced gestation diet throughout pregnancy, avoiding excessive weight gain in early pregnancy. Increase nutrition in the final 3 to 4 weeks with a lactation-grade ration. Ensure a clean, temperature-controlled farrowing pen is prepared by week 15, and monitor closely for signs of complications during farrowing.