Not only did it do more work for less feed, when it had reached the end of useful life it could be put into the stockpot.

Reminded me of the song "Timothy" by the Buoys, the only AM top 40 hit about mining and cannibalism.

Not to start and off-topic thread, but: Horses can be, were, and are put in stockpots at the end of their useful lives. And I don't know of a reason why, if cows can be eaten, horses can't. The alternative is that the horses go to waste, and more cows are raised for slaughter.

Horse remains popular in France, much to the disgust of the English. I wonder if they keep eating it just to irritate the English?