Rumen fermentation characteristics - digestibility and excretion of purine derivates in cows fed with different starch sources

acide gras volatil acide urique acidi grassi volatili acido urico alantoina aliment pour animaux alimentation des animaux alimentazione zootecnica alimenti per gli animali allantoin allantoina amido digeribile amidon digestible animal feeding animal laitier animales lecheros animali lattiferi barley carbohydrate content cebada contenido de carbohidratos contenido de materia seca contenido proteico contenuto lipidico contenuto proteico cows crude protein diet dieta digestibilidad digestibility digestible starch digestive juices dry matter content escrezione excretion faeces feces feci feeds fermentation fermentazione heces in vivo experimentation jugos digestivos lactosa lactose lait latte lattosio leche lipid content mais maize milk milk yielding animals orge orina orzo papa patate ph piensos pomme de terre potatoes protein content proteina bruta proteina grezza purinas purine purines raciones ration rations razioni rumen rumine sperimentazione in vivo suc digestif teneur en glucides teneur en lipides trigo uric acid urina urine vaca vacche vache volatile fatty acids wheats