[The cow feeding in relation to the quali-quantitative characteristics of milk]

alimentation des animaux alimentazione zootecnica animal feeding besoin nutritionnel chemical composition composition chimique composizione chimica cow milk dairy cows lactation lait de vache lattazione latte di vacca leche de vaca milk yield necesidades de nutrientes nutritional requirements raciones ration rations razioni rendement laitier rendimiento lechero rumination ruminazione vacas lecheras vacche lattifere