Did the vet tell you to give a 10 pound bird that amount or are you just following the directions on the box? The directions on the box are for dogs, not peafowl, and peafowl get more.
I'm not surprised, it's way less than what both @KsKingBee were told to use.
Meloxidyl or Metacam, doesn't...
Meloxicam comes as 1.5 mg/ml and 0.5 mg per ml, which one do you have?
The most common dose seems to be ~0.227 mg per pound of bodyweight. So if he weighs 10 pounds he would get 2.27 mg once a day.
Dose:
If you have the 1.5 mg/ml stuff give 1.5 ml once a day
If you have the 0.5 mg/ml stuff...