Infants (<1 year of age)
- Body weight in newborns is 8-10 lbs.
- Body length at birth: 420 mm (16.5 inches)
- Young lambs are a grayish coloration with soft hooves and a black-brown tail.
- Lambs are weaned by 6 months of age.
Juveniles (1-2 years of age)
- Body weight is 41-50 kg (90-110 lb) (females) to 52-59 kg (115-130 lb) (males)
- Body length is 690 mm (27 in) (females) to 915 mm (36 in) (males)
- Yearling ram horn is much like adult ewe horn but thicker at the base and blue-gray.
- Female horns are 125-178 mm long, thin and sharp-pointed.
Subadults (2-3 years of age)
- Body weight is 45.8 kg (101 lb)(females) to 69.4 kg (153 lb) (males)
- Body length is 851 mm (33.5 in) (females) to 991 mm (39 in) (males)
Young adults (4-5 years of age)
- Body weight is 55.6 kg (122.6 lb) (females) to 64.9 kg (143 lb) (males)
- Body length is 965 mm (38 in) (females) to 977 mm (39in) (males)
Adults (>5 years of age)
- Body weight is 57.2 kg (126 lb) (females) to 78.5 kg (173 lb) (males).
- Body length is 876 mm (34.5 in) (females) to 1010 mm (39.8 in) (males)
- Ram adults have a large knob on the back of their head, often calloused and without hair while younger rams often have no knob.
- Permanent dentition is in place after four years of age.
- Sexual maturity (Wilson and Mittermeier 2015)
- Males over 5 years old do most of the breeding
- Females: typically mate at 2.5 years (girth birth when 3 years old)