[Influence of Mg-oxide and Mg-phosphate and of different Mg-concentrations on a roughage/concentrate ration on production and metabolism of the lactating small ruminant]

alimentos concentrados caprinos concentrates contenido proteico digestibilidad digestibility feeding level forraje grosero fourrage grossier goats lait leche magnesio magnesium metabolism metabolisme metabolismo milk milk yield niveau d'alimentation nivel alimenticio protein content ration rations rendement laitier rendimiento lechero roughage