A review: potential for biotechnological applications of keratin-degrading microorganisms and their enzymes for nutritional improvement of feathers and other keratins as livestock feed resources

aliment pour animaux alimentation des animaux animal feeding biotechnologie biotechnology biotecnologia degradation enzimas enzyme enzymes feathers feeds ganado keratin livestock microorganisme microorganismos microorganisms nutritive value piensos plumas plume queratinas valeur nutritive valor nutritivo