Call Duck Limp in One leg

[19burlesonm]

My 3 month old call suddenly went limp in one leg, I discovered this today when I came home from my vacation. He was just at a local fair but wasnt caged with any other animals so he wasnt attacked in any way. I started giving

him niacin added to his 16% Duck feed, any ideas as to what this could be? Maybe a sprain of some sort? I touched his legs and he didnt flinch or freak out or anything.

 

[Abraeri]

Check to see if any part of his feet are abnormally warm/hot, because that would indicate an infection. I would assume if it was a sprain there would be swelling.