Dorset

Sheep

The Dorset or Dorset Horned breed of sheep is known mostly for its prolific lambing. It has been known to produce two lambing seasons per year: bred in May for lambs finished by the holidays, and bred again immediately after the first lambing to produce again in March or April. Both horned and polled Dorsets are all white sheep and medium size having good body length and muscle conformation to produce a desirable carcass. The fleece is very white, strong, close and free from dark fiber.

http://en.wikipedia.org/wiki/Dorset_(sheep)