Martin's SFR 36.8% products labels read:
Poultry use should be at .08% to .33% of the product.....
and if treating the Coop one should use a .5% solution.
The calculations are on the label I have linked above.
Two different recommended percent amounts.
I was having a hard time with this one the (36.8%) not being OK when most other percentages are.
I was going to dig til I found an answer and the label its self is a good enough answer for me. LOL
Martin's SFR 36.8% permethrin is safe for DOGS and CHICKENS..
It's right on the product label which can be read here on page 16:
http://www.domyownpestcontrol.com/msds/permethrin_sfr_label.pdf
Poultry
Northern fowl mites and lice
1-4 fl. oz. to 33⁄4 gallons water (treats 375 birds), 0.08-0.33% AI. High pressure spray.
1 gallon of coarse spray per 100 birds, paying particular attention to vent area.
This product contains this:
Active Ingredient
Permethrin*.......................................................................................... 36.8% Other Ingredients** ........................................................................... 63.2% TOTAL...