I've been reading a lot about minerals, and one recent post said that zinc deficiency is the new copper deficiency. It all seems very overwhelming. I have a doe who has never shown signs of copper deficiency (although my other doe did), but this spring her black coat is starting to rust and the bridge of her nose is balding. Her coat on her back legs is rough-looking, but she doesn't have the bald tip on the tail so no obvious "fish tail." I'm wondering if there's any danger in me giving her a 2 gram bolus (she's a Nigerian) -- Or is the fish tail always present? I'm concerned about giving her copper if it's not an extremely obvious deficiency.