Ram or "sire" breeds excel in growth and carcass (meat) characteristics whereas ewe or "dam" (maternal) breeds excel in fitness (e.g. It’s a large sized breed with rams weighing between 225-300 lbs and ewes between 150-225 lbs. However, many sheep breeds in the US do get that heavy. A female sheep is more of a dainty build, weighing in around 99 to 220 pounds (45 to 100 kg). Its fleece is close and is the finest of the British breeds; but, though white and of good quality, the wool is short and the fleeces relatively light in weight. The average fleece weight of the ewes ranges from 10 to 16 pounds (4.5 – 7.3 kg) with a yield of 45 to 55%. As a medium sized animal, average mature body weight of the Montadale rams is between 90 and 124 kg. Columbia sheep are also hardy and produce fast growing lambs. Distribution. Baby sheep are called lambs up until they are a year old when they are considered an adult. No doubt, a sheep has a greater peripheral vision (270 to 320 degrees) with their rectangular pupils than a human does (155 degrees) with their round pupils. Southdown, breed of medium-wool, dark-faced, hornless sheep originating in the Sussex hills of England.The oldest of all British breeds of sheep, it has an ideal body conformation for meat production. Who's Who in U.S. Sheep Breeds poster), American Sheep Industry Assn., Inc.; 6911 S. Yosemite St.  Suite 200; Englewood, CO 80112-1414  Phone: (303) 771-3500 FAX: (303) 771-8200. Weight: adult rams, 70-115 kg; adult ewes, 50-75 kg. And average live body weight of the mature ewes vary from 68 to 90 kg. Columbia sheep produce a ball of heavy, medium fleece wool with good length of staples and tough, fast-growing lambs. Columbia sheep produce a heavy, medium-wool fleece with good staple length and hardy, fast-growing lambs. When they caught up with the sheep to cut its hair, there was enough wool that they were able to make 20 men’s suits from it. Information on adding new breeds or updating existing information. A large sheep has higher maintenance than a medium sized sheep. ... Sheep survival depends on familiarity with their habitat and they are slow to re-occupy vacant habitats. heavier at weaning and 10 to 18 lbs. www.omafra.gov.on.ca/english/livestock/sheep/facts/12-021.htm The wool is classified as medium wool with a numeric count of 50's -60's. The production traits examined included prolificacy, weight, and wool traits. The Cambridge is a dark faced medium size sheep. An adult male sheep weighs an impressive 99 to 350 pounds (45 to 160 kg). Photo and info from RaisingSheep.net and Wikipedia. An average fleece from a ewe weighs from 10 to 16 lb (4.5 to 7.3 kg), with a yield of 45 to 55%.