I am considering putting my mare on some kind of a feed through fly control supplement for this comming insect season. I board her so not every horse in the barn will be on the same thing. I was thinking of just feeding plain old garlic to help reduce the number to fly bites she gets. If I feed her something like Bug Check or just Organic Garlic, will it still help to reduce the flies on her even if the other horses aren't getting it?
Ok, no one has answered the question yet- not all the horses will be on a feed through fly control supplement- will the fly control I feed my mare still be effective even though everybody's not on it?

I think the feed through stuff would only work if they were all getting it because it stops the flies from breeding and hatching in the poo so they'd just do it in the other horses' poo instead.
If you feed garlic it will reduce the bites because it alters the way they smell so they are less attractive to the insects. This definitely works to some extent as we have been using it for years on ours and you can really see the difference if they don't have it.