Metabolism of purines in relation to microbial production

acide lactique acide urique acido urico age alantoina allantoin blood plasma cow milk dairy cows edad especies excretion feeding level flora microbiana flore microbienne lactic acid lait de vache leche de vaca metabolism metabolisme metabolismo microbial flora milk yield niveau d'alimentation nivel alimenticio orina ovin ovinos plasma sanguin purinas purine purines rendement laitier rendimiento lechero rumen sheep species uric acid urine vacas lecheras xanthine oxidase xanthine oxydase xantina oxidasa