This is my 5 month old rooster, I believe. I was locking them up a few nights ago and noticed he couldn’t get up. He just stands up straight and can waddle a little then usually falls on his back or lays down. What do you think is wrong with him? He eats and drinks normally.
Can you get a photo of his poop? Does he have a hard time pooping?
Have you looked at his vent?
Any chance he could have been injured or into a fight with another cockerel - look through his feathers to make sure there are not wounds or bruising.
Is his crop empty in the morning before he eats/drinks?
While you are checking him out, look for lice/mites, at his legs for any injury/scaly mites, bottom of feet too.
I'm not too sold on this being Marek's. It could be genetic, some type of spinal injury, I just don't know. I would try giving 1/2 tablet of B-Complex and Vitamin E.
There is an old thread that looks very similar to your fella's condition, it has a video as well. Sadly, the OP didn't follow up with an update, but the last post, she did notice that one leg seemed out of place/off and she taped it up - not sure how she did it, but it seemed to be helping.
Hopefully
@Eggcessive or
@coach723 will chime in with their thoughts as well.
https://www.backyardchickens.com/threads/rooster-walking-like-a-penguin.945169/
