Secondary components of legumes—such as lecithin, polyphenols, oligosaccharides; and amylase, protease, trypsin and chymotrypsin inhibitors—can lead to lower nutrient availability, and thus to impaired growth and health of animals (especially in nonruminants). Ruminants generally have less trouble digesting legumes with secondary components since they can inactivate them in the rumen liquor. Their diets can be supplemented by 300 g/kg or more raw chickpea seeds. However, protein digestibility and energy availability can be improved through treatments such as germination, dehulling, and heat. Extrusion is a very good heat technique to destroy secondary legume components since the proteins are irreversibly denatured. Overprocessing may decrease the nutritional value; extrusion leads to losses in minerals and vitamins, while dry heating does not change the chemical composition.
Secondary components of legumes—such as lecithin, polyphenols, oligosaccharides; and amylase, protease, trypsin and chymotrypsin inhibitors—can lead to lower nutrient availability, and thus to impaired growth and health of animals (especially in nonruminants). Ruminants generally have less trouble digesting legumes with secondary components since they can inactivate them in the rumen liquor. Their diets can be supplemented by 300 g/kg or more raw chickpea seeds. However, protein digestibility and energy availability can be improved through treatments such as germination, dehulling, and heat. Extrusion is a very good heat technique to destroy secondary legume components since the proteins are irreversibly denatured. Overprocessing may decrease the nutritional value; extrusion leads to losses in minerals and vitamins, while dry heating does not change the chemical composition.