I've never used rooster booster but to the best of my knowledge, you shouldn't give any supplement that contains thiamine while giving medicated feed or treating with corid because amprolium is a thiamine blocker to starve the protozoa.
Supplementing thiamine will have the affect of negating the...
I personally feel like you are overmedicating, depending on which dosage level you are using. The short heavy dose or the extended dose.
I've only fed medicated purposely once and I remember the guaranteed analysis tag on the bag containing amprolium said not to feed it and dose with additional...