Method for leaching zinc concentrate in atmospheric conditions

摘要

The object of the invention is a compound feed to be given especially as a silage supplement, for increasing the protein-fat-ratio of the milk and improving nitrogen utilization of a dairy cow. The compound feed is characterized in that its crude protein content is not more than 14% by weight as calculated from the weight of the compound feed, whereby the histidine fraction of the crude protein preferably is between 2.8 to 4.0% by weight.