Brucellosis has been found in a domestic bison on the Flying D Ranch near Bozeman, the Montana Department of Livestock said today. Two other bison at the ranch are also suspected of carrying the disease. The ranch is currently quarantined. The brucellosis-infected bison, a 7-year-old cow, was identified as a suspect during routine disease testing conducted by the ranch, which is owned by Ted Turner. Cultures performed at the National Veterinary Services Laboratories in Ames, Iowa, confirmed the presence of the agent that causes brucellosis in the suspect bison. State Veterinarian Dr. Marty Zaluski said the discovery of