Yes. I've
been using the ones from Spalding, 5000/4-5 horses, for about 5-6 years
now. I believe they do help. I still spray in the hot, humid
weather ( worst time for flies in NE). There seems to be a cumulative
effect in that last year we had the least amount of flies ever. Both my
farrier & vet have commented on how few flies there are on the
horses outside the barn & none in the barn. We've maintained 4 -5
horses throughout this time. Also over 10 years of worming all horses on
same 6 week schedule.
