EPIZOOTOLOGICAL STUDIES AND DIAGNOSTIC APPROACHES TOWARDS CATTLE BRUCELLOSIS IN THE SMALLHOLDER DAIRY SECTOR OF ZIMBABWE A thesis presented by GIFT MATOPE BVSc (UZ), MVSc (Qld) In partial fulfilment of the requirements for the degree of Doctor of Philosophy (D.Phil.) Department of Paraclinical Veterinary Studies Faculty of Veterinary Science University of Zimbabwe August 2009