Have a look at this
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CURTIS GEARY" <firstname.lastname@example.org>
Question on Ivermec 1%
I will try to answer your questions as fully as I can. Since we are using ivermectin in an off-label fashion, first I need to say the birds being given ivermectin should not be used for food and the eggs should not be eaten. I am only saying this because I am a veterinarian and this is an off-label use and I am not aware of any controlled studies on the subject of withdrawal times. So for legal and safety reasons don't cull and eat these birds.
However, we eat beef, chicken, pork, etc. everyday that had previously been given ivermectin, but established withdrawal times have been (or should have been) followed. The information that is to follow is from my own personal experience and is not substantiated in any scientific journals as far as I know and is purely for informational use. (That's the end of my little legal/safety speech).
What can happen if too much ivermectin is given? Well, so far I haven't seen an overdose of ivermectin in chickens, however I will extrapolate from other species. Most of the signs have to deal with the neurologic (nervous) system and occasionally involve the digestive system.
In the dogs that I have seen, in mild cases the dogs just act like they are "drunk". They stumble, have difficulty standing up and usually can't walk a straight line. The moderate cases have this plus sometimes have blindness. Both of these cases usually resolve in 3-5 days with just some supportive care. The most severe case that I have seen was a 6 month old black lab puppy that ate the entire dose for a 1,000 pound horse after the horse spit out the wormer on the ground. It was comatose for 23 days, blind for another 10 days and is normal today (2 years later). So the overdose effects can vary, usually very dramatic, but usually resolve. However, death can occur with an overdose.
I like the 1% injectable form because I can draw up exactly 0.1 ml and give it in the breast muscle or by mouth. I also like it because I know that the ivermectin is then getting into the bloodstream.
From other studies we know that ivermectin is absorbed into the bloodstream from the digestive tract. With the 5% oil based solution, it was made to be absorbed through the skin of cattle that has a fatty layer, oil glands, haired skin, sweat glands, etc. and this is totally different than poultry. I am not saying if it works or not. I've never tried it, for those reasons.
the dosages that you have listed look like they would be a good starting point. I would first try them on some culls rather than your best birds and if it works then continue with it. Since chickens have an oil gland near the tail the ivermectin may accumulate there and last longer than the injectable form, I really don't think (but don't know) if it is going to hang around on the body for 6 weeks though. I would be interested to know of anyone else's experiences though.
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here are two chicken friends who use 1% injectable in the drinking water they do raise a lot of birds so they must know
I leave treated water (4 cc per gallon of water) in the coops for 2 days. It is the only water so everyone drinks. I change the water mixture every day and more often if it gets dirty. There is a great margin for safety when using ivermectin so I don't worry about a bird over dosing on it. I have been using injectable ivermectin mixed with drinking water for 5 years now and have never had a problem.
I use the injectable 1 % solution mixed at 8 cc. per gallon of water to treat canaries for air sac mites and to worm chickens, budgies, canaries, cockatiels, etc. I take their water away the night before and use this solution as the only source of water for 24 hours.
It is important to treat again in 10 days to get all the mites that have hatched out since the treatment BEFORE they can lay eggs again. For scaly face/leg mites I treat the birds at least four times.
Hopefully this information can help you decide how to worm with Ivermectin. I have studied this topic for several yrs now and do believe it is safe
Glenda L Heywood Brookings SDfrizzlebird7@yahoo.com