The clinical appearance of many diseases and disorders of farmed pigs is heavily influenced by the pigs' environment. The classical concept ''pathogen meets pig results in clinical disease'' is nearly always incorrect. The pig industry and its servicing veterinary advisors have moved from individual animal medicine through preventive medicine into health maintenance. All of the skills learned previously still need to be employed, but veterinarians are now required to apply a degree of animal science knowledge for which they are rarely prepared.
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