Seeking thoughts on my Droughmaster x Heifer about 2 years old, part of our small herd of 7.  Shifting lamness for nearly 6 weeks, no loss of appetite however losing condition as unable to move freely about the paddock, spends most of the day laying down.  Bright in the eye and doesn't appear to be in pain.  Has had 2 courses of Antibiotics and Anti Inflammatory injections to treat perhaps bacteria infection in her joints however to no avail.  Any thoughts on what this might be would be appreciated .....   with thanks.