Thyroxine, triiodothyronine and reverse-triiodothyronine concentrations in blood plasma in relation to lactational stage, milk yield, enery and dietary protein intake in Estonian dairy cows

besoin nutritionnel blood plasma dairy cows estonia estonie ingestion de substances nutritives lactation milk yield necesidades de nutrientes nutrient intake nutritional requirements plasma sanguin proteine proteins rendement laitier rendimiento lechero thyroxine tiroxina triiodothyronine triyodotironina vacas lecheras