Feeding of high yielding dairy cows. Part 1. Feed digestion and metabolism, milk synthesis and nutrient requirements [also incl. AAT-PBV system]

acide gras aliment pour animaux amino acids besoin nutritionnel chemical synthesis contenido proteico dairy cows digestion energia energie energy fatty acids feeds lactation lait leche metabolism metabolisme metabolismo milk milk yield necesidades de nutrientes nutritional requirements piensos protein content proteine proteins rendement laitier rendimiento lechero rumen vacas lecheras