There are two reasons for that: on farms with milk production milk substitutes are being increasingly used, while on the other hand on farms with sucler cows milk is sucked directly by calves (not milked).
Za to sta dva vzroka: na kmetijah, kjer se ukvarjajo s prirejo mleka, uporabljajo v večji meri mlečne nadomestke, na kmetijah, ki so se preusmerile v rejo dojilj, pa teleta mleko posesajo (se ne molze).