[Use of copper for the support of physiological reproductive processes. 1. Copper level in the serum of castrated male swine after various applications of copper and copper compounds].

Various copper compounds (CuSO4, Cu-glycinate, Cu-lactate, Cu-citrate) were applied subcutaneously, intramuscularly, and intravenously to 17 barrows, doses being up to 50 mg Cu, while doses between 0.5 g and 1.0 g CuSO4 were orally administered. Curves of copper levels in the serum then were checked at different times. In response to intravenous application, copper levels reached maximum values as early as after two minutes and dropped to the normal about 90 minutes from application. Subcutaneous and intramuscular applications had but little effect on serum copper levels, while oral administration actually had none at all.