On the little herd that we have, they did not get copper in the mineral for about a month or so. When they did, they looked better, more shine in the eyes and just seemed happier overall. I am the copper does not leach out of their systems very fast and they can go awhile. Once they got free feed mineral the water usage went up a lot. In fact the 1 bottle baby we have learned a lot faster how to drink out of bucket instead of a bottle!