Liver biopsy in sheep.

Liver biopsies were performed in the same group of 16 sheep on 8 consecutive wk using an apparatus with a fibre optic continuous light source and a telescope. The sheep were placed in a sternal position on a special table constructed of metal pipes (3.8 cm diameter) and 4.5 cm spacing. Approximately 300 mg of fresh liver sample was removed from each sheep to be analyzed for copper or vitamin E.