Različna razmerja v koncentracijah različnih rudninskih snovi v obroku spreminjajo njihovo izkoristljivost in s tem ugodno in neugodno vplivajo na proizvodnjo, plodnost in zdravstveno stanje živali. ...Zato poleg normativov o potrebnih količinah posamezne rudninske snovi v obroku uporabljamo tudi normative, ki določajo optimalna razmerja med njimi. Z analizo 87 povprečnih obrokov iz 59 kmetij v SLoveniji smo v 66 obrokih (75,9 %) ugotovili nad 6,0 gkalcija suhi snovi. V 33,6 % obrokov je bilo razmerje med kalcijem in fosforjem neustrezno (pod 1,5 ; 1 ali nad 2,0 : 1). V 27. obrokih (31,0 %) je bilo premalo cinka (pod 50 mg/kg SS). V analiziranih vzorcih pašne trave (n=11), travne silaže (n=11) in koruzne silaže (n=5) smo ugotovili visoke koncentracije železa (pašna trava 464 mm/kg SS: travna silaža = 1715 mg/kg SS; koruzna silaža = 305 mg/kg SS). Sklepamo, da lahko ugotovljene velike količine kalcija in železa v obrokih za krave molznice neugodno vplivajo na izkoristljiovst cinka.
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