Production of animal feeds from waste materials; a review of 237 patents and patent applications published between January 1, 1970 and June 1, 1975 in the United States and Western Europe concerned with methods and apparatus for the production of animal feeds from vegetable, animal and industrial waste

aliment pour animaux animal animales animals desechos desechos industriales feed industry feeds industria industria de piensos industrial wastes industrie industrie de l'alimentation animale industry piensos proteine proteins subproductos wastes