I would think it would draw flies to them. A home made nat trap is cider in a glass with plastic over the top and a small hole in the middle. The nat is attracted to the cider vinegar and goes thru the hole and can't find it's way back out.
I had to put a little Skin So Soft on my dog because she was getting torn up by horse flies.. She had huge welts all over her... Amazing how well a little bit went a long ways.. What little I put on lasted for a couple days.. They instantly left her alone.. Just a couple squirts then I rubbed it in..
If I had a cow or two.. .I'd consider it, but not a herd.. I'd bet less than a quarter bottle would work well for a cow..
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