Average: 147 days (range 142-152)
Sheep gestation averages 147 days (5 months), with a range of 142-152 days. Most sheep breeds are seasonal breeders, cycling in fall as day length decreases. Ewes cycle every 17 days with estrus lasting 24-36 hours. Average litter: 1-3 lambs (twins most common in prolific breeds). Pregnancy can be confirmed by ultrasound at 40-60 days — also determines twin/triplet status for nutritional management. Ewes carrying multiples need 50-70% more energy in the last 6 weeks. Vaccinate with CD/T (Clostridium/Tetanus) 4 weeks before lambing to provide colostral antibodies. Prepare a clean jug pen for bonding after birth.