What are the amounts of B and E vitamins in the Rooster Booster? The only thing left to try would be increasing those vitamins on the chance they can repair any neurological damage and strengthen the legs. I would use whole people vitamins and give them right into the beak without mixing, dissolving or diluting.
If this little patient doesn't respond to these vitamins, we are left to conclude this is indeed Marek's.
If this little patient doesn't respond to these vitamins, we are left to conclude this is indeed Marek's.