Shearers have no Bums

It looks comical,
Four shearers stand in a row
Each with a reclining sheep's hoof between his bottom cheeks.
Shearers are lithe and wiry.
They need their belts,
To hold up their trousers.
They have no problems touching their toes,
And when they are on the long blows,
They kneel like sprinters on their blocks.
Shearers work very hard.
During breaks they stretch out on the board,
To unbend their bent backs.
Shearers have soft hands,
From the lanolin,
With prickles,
From the thistles.
Shearers are pranksters.
They brand the roustabout.
And shave off his eyebrow.
Shearers like country music.
Hank, Slim and Johnny,
And they like it,
Loud!