I had mites, not fleas. I assume this would work on fleas. PM Megan, she has all the details.
I am sorry, I am unable to find that site which had the Advocate. Again, try Megan.
http://www.worldwidepetsupplies.com.au/advocate-cat/
This is the one you need to buy
Remember when u apply it spread the feathers and apply 1-2 drops behind the neck of the chickens directly on the skin!! 2 drops for adult chickens! 12-24 hours to start working