Affiliation: | 1. Coll. of Veterinary Medicine, Nanjing Agricultural Univ., Nanjing 210095, China;2. Inst. of Nutritional and Metabolic Disorders in Domestic Animals and Fowl, Nanjing Agricultural Univ., Nanjing 210095, China;3. Coll. of Veterinary Sciences, Univ. of Nyala, Sudan |