I am planning on using Ralgro when I work my calves in the next couple of weeks. Even though it says for use on heifers, I have a concern on the effects if I plan on keeping any for replacements. The directions say "do not use after weaning in heifers intended for reproduction." Does this mean I should avoid using it on heifers if I am beginning weaning when I work them the first time even though they will not be bred for several months?