Hmmm. I never connected Old Gray Mare and Little Black Bull (Sam Houston) until now. Obvious when it's pointed out to me! Thanks.

For what it's worth, I'll post the version I learned from Cyril Tawney. He sang it in his "mock rustic" style and declared the version was collected in England - but didn't much into where/when. I was taken with the pronounciation of Houston as "hoos-ton." The all-but-the-same DigTrad version is at Click

  Sam Houston
  
  1. There was an 'eifer in a medder   [meadow] 
             Houston, Sam Houston 
     There was an 'eifer in a medder 
             A long time ago. 
   
          CHO:        It was a long time ago-o-o, 
                  A long time ago-o-o, 
                  There was an 'eifer in a medder 
                  A long time ago-o-o, 
   
  2. There was a fence adound that medder 
             Houston, Sam Houston 
     There was a fence adound that medder 
             A long time ago. 
   
          CHO: 
   
  3. A big black bull came down from the mountain. 
   
  4. He jumped that fence and he oofed that 'eifer. 
   
  5. He missed his mark and he phttt in the medder. 
   
  6. The big black bull went back to the mountain. 
   
  7. His head hung low but his balls hung lower.