In Holland an analyses of Alfa Accountants and Advisors shows that contracting out the feeding of cows to a contractor with a mixer feed wagon is the cheapest way of feeding dairy cows compared to feeding with an own self-propelled mixer feed wagon, an own combination of tractor and pulled mixer feed wagon and an automatic feeding system. Feeding by contractors costs average 2.10 euro per 100 kilogram milk. Feeding by an own tractor and pulled mixer feed wagon and by an automatic feeding system both costs 2.80 euro per 100 kilogram milk, feeding by an own self-propelled mixer feed wagon costs 3.30 euro per 100 kilogram milk.