Due to all the wet weather we are having a lot of parasite issues with 2 of our first fresheners this year. We've dusted the barn and the girls with DE, done 2 rounds of ivermectin with no result even though it has always worked in the past, did a round of valbazen last week and don't see much change... is it time for something else? And if so, what? I have read on fias that safeguard is pretty pointless, is it cydectin time? Or anyone else have another suggestion? Thanks in advance!