My Nubian had a Bo-Se injection prior to me purchasing him. He's a little over 3mos old now. My Nigerian Dwarf is now a little over 5mos old and he's had one back in April Is it ok to give them Selenium tablets as a preventative measure for Selenium deficiency? They get free choice minerals. I found these Selenium tablets that are 200mcg. Do you think it's safe to give them this, and if so.. how many and how often?