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The purpose of this text as stated in the preface to our book" Swine Production in Temperate and Tropical Environments," 1974, is to provide a technical basis for successful production of pork in both temperate and tropical environments. The competitive position of pork as a food source both in the developed and developing countries has continued to be strengthened during the past 1 0 years. In this book, we update the current knowledge and technology upon which pork production is based-covering extensively the new knowledge of feeds and their nutrient values. The current growth of the world swine population is faster than that of the human population, reflecting the high demand for pork among consumers in all parts of the world. Advances in genetics, physiology, nutrition, and bio technology have permitted continued improvements in efficiency of pork produc tion, and prospects are bright for continued …