Anatomy and Physiology of Farm Animals
http://www.amazon.co.uk/Anatomy-Physiology-Animals-Rowen-Frandson/dp/0813813948/ref=sr_1_1?s=books&ie=UTF8&qid=1340011287&sr=1-1
Principles of Bacterial Pathogenesis
http://www.amazon.co.uk/Principles-Bacterial-Pathogenesis-Eduardo-Groisman/dp/0123042208/ref=sr_1_sc_1?s=books&ie=UTF8&qid=1340011455&sr=1-1-spell
Clinical Examination of Farm Animals
http://www.amazon.co.uk/Clinical-Examination-Animals-Peter-Jackson/dp/0632057068/ref=sr_1_1?s=books&ie=UTF8&qid=1340011542&sr=1-1