Sheep Gestation Calculator

Calculate your ewe's expected lambing date. Enter the breeding date to see the full pregnancy timeline and key milestones.

Date when ewe was bred

Sheep gestation period: 144-155 days (average 147 days); Expected Lambing Date = Breeding Date + 147 days; Range: Breeding Date + 144 to + 155 days; CDT vaccination recommended 2-4 weeks before expected lambing
Example: Breeding on September 1; Earliest lambing: January 23 (Day 144); Average lambing: January 26 (Day 147); Latest lambing: February 3 (Day 155); Vaccinate with CDT around January 5-12

How long are sheep pregnant?

Sheep gestation period averages 147-152 days (about 5 months), with a normal range of 144-155 days. Ewes carrying multiple lambs may have slightly shorter pregnancies (1-3 days less). First-time mothers often carry 2-5 days longer. Breed affects gestation length: Smaller breeds (e.g., Dorset): 144-150 days, Medium breeds (e.g., Suffolk, Hampshire): 147-152 days, Larger breeds (e.g., Cotswold): 150-155 days. Season and nutrition can also influence gestation length.

What are the signs that a ewe is about to lamb?

Signs of impending lambing (1-2 days before): Udder becomes full and shiny ("bagging up") 2-4 weeks before, Vulva becomes swollen and relaxed, Ligaments around tail soften and relax (check by pressing near tail base), Restlessness, pawing ground, bleating more, Isolation from flock, Nesting behavior (scraping ground), Clear mucus discharge, Water breaks (straw-colored fluid). Active labor signs: Contractions visible, ewe lies down, straining begins. First stage of labor can last 2-6 hours. If active labor exceeds 30-45 minutes with no progress, assistance may be needed.

How many lambs do sheep typically have?

Lambing percentage varies by breed and management: First-time ewes: Usually 1-2 lambs, Mature ewes (2-5 years): 1-3 lambs average, Prolific breeds (Finnsheep, Romanov): 2-4+ lambs, Meat breeds (Suffolk, Dorset): 1-2 lambs. Nutrition affects litter size: Flushing (extra feed 2-3 weeks before breeding) increases ovulation rate. Ultrasound at 50-60 days can confirm pregnancy and count fetuses. Proper nutrition during last 6 weeks of gestation is critical for lamb development and ewe milk production.

How do I prepare for lambing season?

Preparation checklist: Lambing jug (individual pen): 16-25 sq ft per ewe with lambs, clean and bedded deeply; Supplies: Iodine (7%) for navels, towels, obstetrical gloves, lubricant, colostrum replacer, feeding tubes, heat lamp (if cold), thermometer (normal lamb temp: 102-103°F); 2-4 weeks before: Vaccinate ewe with CDT vaccine (boosts antibodies in colostrum), Shear belly if wool is long, Move to clean lambing pasture or barn; During lambing: Ensure lambs nurse within first 2 hours (critical for colostrum), Dip navels in iodine, Dry lambs if cold, Monitor bonding. Keep records of birth dates, weights, and any issues.