Need some brain storming please?!?! Tricky horsey problem?!?!?

I know that you've probably spent thousands trying to eliminate or at least improve on your geldings issue, so here are a couple of more unorthodox methods that wouldn't hurt to try. a href="http://en.wikipedia.org/wiki/Probiotics" rel="nofollow"http://en.wikipedia.org/wiki/Probiotics/a this website or others like it may give you some ideas on how to introduce some type of probiotic into his general system. Another thought that I had surely wouldn't hurt and it could help one heck of a lot. Diatomaeterous Earth (flour fine) sprinkled on the area and on his whole body would stop not only the flies on him but get some in his feed and it will p through and affect the reproduction of flies in his pasture as well...you can also sprinkle the DE on the piles and soon, there just won't be as many flies to bother him, sometimes it completely eliminates them...it sure wouldn't hurt to try and it is very inexpensive. Adding white or apple cider vinegar to his drinking water will change his PH somewhat, making him not so desirable to the flies, plus, sometimes it actually alters conditions similar to this. White vinegar is more palatable to the horse than the cider vinegar. (I know that I probably mispelled DE, but you know what I mean. There is something else that I just thought of....you know those "post race, urine catching containers that they use for geldings?..the ones where they stick on and stay pretty good until you take them off, and that is with them holding the weight of the sample...it's sorta like a giant plastic condom that is attached directly over the end of the sheath and sticks to the belly (belly could be clipped to avoid more irritation) The end of the condom like container (stays folded up until something is deposited in it, could be either altered with hot ice pick holes (using a hot ice pick will make holes in the plastic that won't tear) allowing the urine to p through, but not allowing the flies back in (small holes) I hope that I didn't make this too complicated, but I think that it would protect your gelding from the flies, allow him to relieve himself an be fairly simple to change out when necessary... Good luck.