Chicken with THICK legs

[GingerAndHerChicks]

Are her hock joints swollen as well? Mycoplasma synovitis (MS) can cause swollen ankles and hocks. That is a bacterial infection of the joints, and may cause mild respiratory symptoms, or none at all. Osteopetrosis or marble leg syndrome is a type of lymphoid leukosis, and the legs are thick and hard. Is this hen mixed with any other breeds, such as a cornish? Here is a picture of a rooster with osteopetrosis:
https://www.google.com/url?sa=i&url=https://www.backyardchickens.com/threads/my-rooster-has-swollen-legs.898073/&psig=AOvVaw37SY-JkrANTIFvBg6Eswlp&ust=1629234246200000&source=images&cd=vfe&ved=0CAgQjRxqFwoTCNjS9Ny4tvICFQAAAAAdAAAAABAD

Here is a picture of a chicken with suspected MS:
https://www.backyardchickens.com/content/type/61/id/7262775/

Yeah definitely looks like swollen hocks.

 

[Eggcessive]

It can be hard to treat, but tetracycline antibiotics and tylosin (tylan) are sometimes used when first noticed. Here is a good article about MS in poultry:
https://www.merckvetmanual.com/poultry/mycoplasmosis/mycoplasma-synoviae-infection-in-poultry

 

[GingerAndHerChicks]

It can be hard to treat, but tetracycline antibiotics and tylosin (tylan) are sometimes used when first noticed. Here is a good article about MS in poultry:
https://www.merckvetmanual.com/poultry/mycoplasmosis/mycoplasma-synoviae-infection-in-poultry

I just ordered some online since I can’t get it locally. 1-3 days should be here. I’ve never really thought that keeping chickens would be this tricky.

 

[Eggcessive]

Mycoplasma gallisepticum (MG) and mycoplasma synovitis (MS) are fairly common in some backyard flocks. MS is less common. Those are lifelong diseases, and survivors are carriers. Testing is something that you might want to do to confirm it. Here is some more info regarding MS:
https://waddl.vetmed.wsu.edu/animal-disease-faq/mycoplasma-synoviae