The TUNE given in the DT does NOT belong to this song: don't know what has happened there but it's very obviously from a totally different song! And the transcription given by IvanB on 01.12.01 has disappeared too.
But here is a YouTube of Davy himself singing it:
https://www.youtube.com/watch?v=kKCbJSNNIYY
Give me time and I might be able to come up with some dots and chords...as some people have been waiting over 10 years for them!

And referring back to BK's post in 1999: some confusion here, I think.
There is a thread somewhere about "The Last Of the Clydesdales" but I think the Garnet Rogers song is "The Field Behind the Plow".