So sorry to hear this ant farm.
I agree with hellbender, that looks pretty bad.
If it isn't as bad as it looks and you insist on keeping it check out Lambert Kay EMT gel at TSC, good for man and beast, including birds and reptiles.
active ingredient Type 1 Hydrolysate of Collagen which provides a matrix for new cell growth.Seals and protects wounds, Promotes rapid healing, Relieves pain & itching, Reduces scarring, Non-toxic and non-sensitizing.
Seals off nerve endings to diminish pain and itching, and forms a protective barrier over the wound that reduces the chance of infection. Collagen formulation works with the body to speed new cell growth and healing.
I saw it work wonders on a bad flesh wound into the meat on my dog, was amazing, left no scar and the hair even grew back. I sprayed the wound with iodine first, Betadine, and then only used the EMT gel. Though I doubt your rooster will ever have a tail again, if it lives.