This updated and expanded edition offers current knowledge of nutrient metabolism and the formulation of diets from an array of available feedstuffs. Discusses animals' role in ecological balance, environmental stability and sustainable agriculture and food production. A new section on life-cycle feeding of individual animal classes features chapters contributed by authorities in their respective fields of animal nutrition. These new chapters include cattle, poultry, rabbits, sheep, swine, horses, cats, fish and exotic animals.