The front leg injury looks similar those on other bucks I have seen from fights during the rut. The swelling/injury to both back legs is not something I have seen. Maybe someone else can add more.
I just learned about mycoplasmosis in cattle last week. It is a swelling in the leg joints that looks like arthritis but is the result of an infection. Looks very similar.
There is no cure and over time, the cattle will lose their appetite and look unthrifty, eventually dying.
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