I have (4) 6 month old chickens that have never been wormed. After looking at their stools it appears that at least one has worms. I am unsure of the type of worms. They are tiny, white, and not moving. I went to the feed and tack store and purchased wazine. I did ask about anything topical and they did not have ivermectin. Can someone recommend a dosage for wazine. Bottle reads 2 ounces in 2 gallons per 100 birds. Thanks in advance for any advice.