🐑 Sheep Gestation Calculator
Estimate lambing windows and coordinate flock management tasks from breeding through delivery.
Record the date ewes were serviced or synchronized AI was performed.
Gestation Overview
Sheep gestation averages 152 days. Twin-bearing ewes may lamb a bit earlier than singles.
How to Use This Calculator
Log service dates
Enter the breeding date for each ewe or breeding group to forecast lambing clusters.
Plan nutrition & shelter
Use the estimated window to adjust late-gestation feed and prepare lambing pens or jugs.
Schedule health checks
Coordinate vaccinations, body condition scoring, and veterinary visits around the milestone reminders.
Formula
Lambing Date ≈ Breeding Date + 152 days
Allow for a ±5 day range to account for litter size, ewe age, and breed-specific variation.
Full Description
Planning lambing seasons improves productivity, labor allocation, and lamb survival. This calculator offers immediate due date projections plus reminders for vaccinations, scanning, and pen preparation.
Maintaining accurate breeding records allows flock managers to analyze conception rates, adjust ram deployment, and optimize nutrition programs year over year.
Frequently Asked Questions
How can I detect pregnancy in ewes?
Ultrasound scanning around 70–90 days post-breeding determines pregnancy status and litter size.
When should I vaccinate before lambing?
CDT and other recommended vaccines are often given 4 weeks before lambing to boost colostrum antibodies. Consult your vet for regional guidance.
Do weather and season affect gestation?
Extreme weather and nutrition can influence lambing dates slightly. Provide shelter and balanced feed throughout gestation.
What if lambing extends past the late window?
Monitor closely and seek veterinary help if no lambing occurs by 156+ days or if the ewe shows distress without progress.