flies in barn

What can I use to get rid of the flies in the barn. I have a horse barn and the flies in the stalls are horrible. I live in south texas. I have used sprays and fly bait and nothing works. Anyone with a solution?

I've heard that Fly Predators work great and are inexpensive. I plan to start using them soon: Fly Control: Spalding Labs Knows Fly Control, Hands Down!

Spalding Fly preadators I used them this year and had only a handfull of flies. Put up a few fly strips for the few flies you will get from neighboring properties. Fly bates just draw thw flies to your barn. THEY DO WORK!!

Sponge your horse down with warm water, and in a liter bucket of water place 2 caps of methylated spirit, this will keep the flys off and not hurt the horse (its also great for evaporating sweat off and keeping clean as it cleanses the skin) if you need it a bit stronger add a few drops of citronella oil and some eucalyptus oil. Works all year round.