High Quality Content by WIKIPEDIA articles! Poco Bueno a brown quarter horse stallion foaled April 10, 1944. He was sired by the great Quarter horse stallion King P-234 and out of the mare Miss Taylor who was by Old Poco Bueno. Poco Bueno was named for his maternal grandsire, and the name means pretty good in Spanish. Poco Bueno is the stallion that is linked to the genetic disease Hereditary Equine Regional Dermal Asthenia (HERDA) in stock horses.