There are two reasons for that: on farms with milk production milk substitutes are being used more, while 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, v večji meri uporabljajo mlečne nadomestke, na kmetijah, ki so se preusmerile v rejo dojilj, pa teleta mleko posesajo direktno (se ne molze).