The California Variegated Mutant, or CVM, is a mutation of the Romeldale sheep, a dual purpose breed developed by A. T. Spencer in the early 1900's. Mr. Spencer crossed imported New Zealand Marsh Romney rams with his Rambouillet ewes to increase the staple and length of fleece and to improve the carcass quality.
During the 1960's, Glen Eidman found a multi-colored ewe lamb in his purebred Romeldale flock. Two years later, a ram lamb with the same coloration pattern was born. When the ewe and ram were crossed, the resulting offspring also had the same unique color pattern. Through subsequent breeding and further mutations, the CVM breed was painstakingly developed by Glen Eidman over a 15-year period. During that time, Mr. Eidman did not sell any of the CVM sheep, in order to maintain complete control over the breed's development. Upon retirement in 1982, only the top 2/3 of the flock was dispersed. Today there are fewer than 20 breeders in the country.