From the Cheat Sheet...
-(From Buck Jones) I add approximately oneteaspoon of vanilla flavoring extract, real or artificial, to onegallon of drinking water in an effort to reduce fly strike and warblesby reducing the number of flies in and about our rabbits.
The whole idea is to keep the odor down so flies won't be attracted.Putting vanilla in the drinking water i supposed to cut down on theodor of the urine. It's also supposed to prompt the bunnies to drinkmore, so I would think that the urine would be more diluted , too.
Using a good litterlike Woody Pet will also help keep the odor at a minimal
I think there are even foods manufatured to help eliminate odor.
To prevent "fly strike" the flies must be keep from getting to thebunnies. If you have a fly problem, then cleanliness is essential. Keepthe buns and everything around them as clean as possible. Netting andfly strips for outdoor bunnis will help.
Make sure the bunnies are healthy and have no open wounds, too.