Large quantities of by-products are produced worldwide, severely polluting the living environment, but simultaneously representing a potential resource of protein and carbohydrate feedstuffs for farm animals. The passage of these materials into water, soil and air may be partially diverted by appropriate technologies into a natural cycle of organic resources, leading to the production of substances for plant as well as animal nutrition. Thus the animals become effective convertors of secondary products of the ``man-changed'' ecosystem into animal protein for human nutrition. This book demonstrates the great possibilities of obtaining nonconventional feedstuffs from by-products, thereby solving the problem of how to use these resources most effectively. Zdroj anotace: Web obalkyknih.cz