Found this on another post on here
Does he get back up after an episode ?
Here is an article from Kimberly Link about seizures. It is from the Majestic Waterfowl newsletter.
"Lifelong seizures are often the result of neurological disorders, which can be genetic, but are more likely the result of a brain or spinal accident that occurred while they were still inside their egg, or the result of an early life injury caused by mishandling (children who hold on too tight), dropping or falling.
The sudden onslaught of seizures in adult ducks and geese is most commonly the result of some kind of poisoning
(see our June 2013 Newsletter for detailed information),but other causes may include: injury, tumors, cancer, malnutrition, heatstroke, organ failure and contagious disease.
If your duck or goose is experiencing seizures it's vital that they receive
immediate vet care.
To keep your pet's strength up until you arrive at your vet's office, you can give adult birds that weigh more than 3 pounds a 6 ml dose of Karo syrup immediately following each seizure, but remember, this is
not a cure. You and your vet will need to determine the cause of the seizures and the appropriate treatment regime."