Rambouillet sheep (rămˈbŏlāˌ) [key], fine-wool breed developed in France from the Spanish Merino sheep. It has become very popular in the United States and is the foundation of most of the Western range flocks. Intermediate to large in size, Rambouillets are the largest and strongest of the fine-wool sheep; the rams are horned, the ewes hornless. Besides being valued for their high-quality wool, Rambouillets are also good meat animals. The ewes are bred extensively on the range to coarser-wooled rams, especially of the Hampshire and Suffolk breeds.