Part I: Principles and Methods: 1: DNA Markers, Genetic Maps and the Identification of QTL: General Principles, A M Crawford, K G Dodds andJ C McEwan 2: Modelling Farm Animal Diseases, S C Bishop and G Gettinby 3: The Immune System, M J Doenhoff 4: The Major Histocompatibility Complex and its Role in Disease Resistance and Immune Responsiveness,M F Rothschild, L Skow and S J Lamont 5: Rodent Models of Genetic Resistance to Parasitic Infections, D Wakelin Part II: Parasites and Vectors: 6: Genetics of Helminth Resistance, L C Gasbarre and J E Miller 7: Host Resistance to Ticks and Tick-borne Diseases: Its Role in Integrated Control, B Minjauw and J J de Castro 8: Genetic Aspects of Resistance to Ovine Cutaneous Myiasis, H W Raadsma 9: Exploitation of Resistance to Trypanosomes and Trypanosomosis, G D M d'Ieteren, E Authie, N Wissocq andM Murray Part III: Bacteria: 10: Genetic Aspects of Resistance to Ovine Footrot, H W Raadsma 11: Mastitis in Dairy Cattle, J B Owen, R F E Axford and S C Bishop 12: Escherichia coli and Salmonella Diarrhoea in Pigs, I Edfors-Lilja and P Wallgren Part IV: Viruses and Subviruses: 13: Viral Diseases, K A Schat and C J Davies 14: Diseases Caused by Maedi-Visna and Other Ovine Lentiviruses, J C DeMartin, A de la Concha-Bermejillo,J O Carlson and R A Bowen 15: Transmissible Spongiform Encephalopathies, N Hunter Part V: Production Diseases: 16: Genetics of Susceptibility in Cattle and Sheep, C A Morris 17: Breeding for Disease Resistance to Production Diseases in Poultry, B H Thorp and E Luiting 18: Genetic Aspects of Health and Disease Resistance in Pigs, B N Wilke and B A Mallard 19: Lameness, O Distl