I did for the first time this year.
I found my goats had a near immediate improvement in their coat condition and one girls color came in drastically darker in just a few days.
I only have nigerians so I split the capsule down quite a bit...can't remember off the top of my head, but a whole one seems like a lot??? How big are your goats? I think I read on here about someone with boers giving a whole capsule.....
I use sweetlix magnum milk for my goats and they still need copper and BoSe. The vet originally wouldn't give me the BoSe because when she was out to our house, She said they all looked healthy and fine. When my mama delivered and the babies legs were weak I rushed them in to the vet, and the selenium fixed them up right away. I realize you are pretty far away, but I would ask the vets around you if goats in your area seem to be needing the selenium as well as the copper. (Maybe the breeder could tell you if you need the selenium too???)
Somewhere on here (BYH) is the dose for the copper.
I am in central California BTW.