COPPER IN THE MUSCLES AND LIVERS OF CALVE S AND OTHER MAMMALS

The copper contents of the livers of various farm and wild animals are compared with one another and it is shown that the essential element copper is controlled in nature and occurs at the same level in almost all species of mammals, and at a much lower level in the musculature, where the natural copper contents of fodder and grazing plants arte ma de available to the animals. Where a higher level of copper is given v ia the feed there is a build-up in the liver, particularly in young an imals, but this is not observed in the musculature.