Background: I typically bolus our adult Nubians with Copasure (1g/22#) every 4-5 months - when they start looking rough and rusty. They were looking like this again so I bolused - and then checked my records (I know, always check records first) and I had bolused them in early August - so this time Copasure was given only 3 months apart. This made me start wondering about toxicity, especially since two does are pregnant. (BTW, they always have goat specific minerals free choice available to them as well.) Has anyone experienced toxicity using the slow release copper rods? Just wondering if I should be concerned or not.