The article is by Vic Gammon in EFDSS journal Vol 10 number 1 2011. "Farmyard cacophonies. 3 centuries of a popular song."
The song is by Tho. D'Urfey
Not sure how much I can quote without breaching copyright, but basically the words are
In the fields in frost and snow
Watching late and early
...then 2 lines about the animal the sing is milking / shearing etc
And a chorus with animal noises "here a boo, there a boo everywhere a boo" etc,
It then goes on to talk about other animal catalogue songs and analyse them. Including the versions you wouldn't sing at a Sunday School concert.