Contact your Dept of Agriculture. Should be a listing of poultry labs in your state you could find just by googling.
Found this myself:
The Texas Veterinary Medical Diagnostic Laboratories (TVMDL) are some
of the busiest full-service veterinary diagnostic laboratories in the
world, receiving more than 160,000 cases in need of diagnostic
assistance each year. At its two major locations in College Station and
Amarillo, Texas, TVMDL performs diagnostic testing for thousands of
veterinary hospitals and clinics in Texas and throughout the country.
Two poultry labs, one in Center, Texas and the other in Gonzales,
Texas, serve the poultry industry through disease surveillance and
Some of our local Austin folks take chickens for necropsy ( find out
the cause of their death) to the TVMDL lab in Gonzalez. There are
poultry labs in Gonzalez and Center, TX.
1812 Water Street
Gonzales, TX 78629
635 Malone Drive
Center, TX 75935
Some folks have sent their dead chickens to this lab where they will study their cause of death. You can even call them and chat with an avian specialist to get more info. Ship them in an ice chest packed with ice using next day delivery. Do not freeze the body. Just refrigerate them until you ship. Check shipping rates verses gas to drive to the lab.
If the numbers Speckledhen shared don't do you much good, call
J.C. Essler @ 979-845-4186
I think he works out of the Bryan/College Station location. He was extremely knowledgeable and helpful, and i'm sure he could point you in the right direction. I'm sure that if you explain your situation to him, he could tell you exactly what is available in our state.