[Dairy cows feeding. Comparison between indications on the quantity in mineral content]

absorption de substances nutritives alimentation des animaux alimentazione zootecnica animal feeding assorbimento di elementi nutritivi besoin nutritionnel calcio calcium dairy cows fosforo lactation lattazione necesidades de nutrientes nutrient uptake nutritional requirements oligoelementi oligoelementos phosphore phosphorus trace elements vacas lecheras vacche lattifere