Author's Organization:Department of Veterinary Pathology, Nippon Veterinary and Zootechnical College Department of Veterinary Pathology, Nippon Veterinary and Zootechnical College Department of Veterinary Pathology, Nippon Veterinary and Zootechnical College Department of Veterinary Pathology, Nippon Veterinary and Zootechnical College Department of Physiological Chemistry, Nippon Veterinary and Zootechnical College Department of Veterinary Pathology, Nippon Veterinary and Zootechnical College Department of Veterinary Pathology, Nippon Veterinary and Zootechnical College Sakai Domestic Fowls Laboratory