I have noticed that a lot of people use or recommend Blu-Kote for chicken care, but I would not recommend it for use on chickens. Like cats, chickens pick and preen at themselves and there is no way to stop them. Also, the warnings for Blu-Kote specifically state not to use it on food producing animals. Please be aware of these things before you choose whether or not to use Blu-Kote on your chickens.
Dr. Naylor Blu-Kote Caution(s)
For external veterinary use only. In case of serious burns, deep or puncture wounds, or if redness, irritation or swelling persists or increases, discontinue use and consult a veterinarian. Keep away from the eyes, mouth, nostrils, and mucous membranes. Do not spray in the eyes. Do not inhale. Do not use on cats. Prevent dogs from licking the treated area.
For animal use only.
Keep from the reach of children.
Use only as directed.
Not for use on food producing animals.