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Thank you for the reply. How much do you poor on the hens? That sounds alot easier then dusting everyone.
Ivermectin Pour-on... For the pour on Ivermectin for cattle (not Eprinex) the dosage use is as follows:
1 drop - OEGB sized small bantam female
2 drops - OEGB sized small bantam male
3 drops - average bantams
4 drops - large bantams, small commercial fowl
5 drops - most commercial fowl, small giant hens
6 drops - giant breeds of chicken
I always use a 3 cc syringe that I just take the needle off of. This makes it easier to dispense a controlled correct sized drop. It also is easier to get in-between the feathers. The best place I have found is under the wing, it's bare enough that the liquid will get right on the skin. It's a systemic control, (has to go on skin) it will kill all worms (except tape-worms) and kills all blood feeding insects. (It won't do any good if you just get it on the feathers). It won't kill any lice that just eat dander that don't actually feed off the chicken... For those kinds you will have to use dust. If you have an infestation it will need to be applied once and then again 10 days later to kill any newly hatching larva, after that you can just do it a couple times a year.
Hope this helps!