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Norfolk Town's Schools First To Be Heated By Burning Cattle
A "trailblazing" Norfolk town has begun heating many of its buildings - including the schools - by burning oil made from melted-down cow and pig carcasses. The strategy is described as "equal or lower in carbon footprint than natural gas." Should schools have to offer vegetarian heating?
There's a good reason for this. If you had read the article, they said that proponents of burning animal carcasses admitted that, by itself, it's a very inefficient method of heating, since so much energy has to go into raising these animals to maturity; you end up getting less energy from burning them than you did getting to that point.
However, the animals' primary use is for food, not heat. The carcasses burned are just a leftover waste product normally, so burning them for heat makes sense because otherwise the carcasses would just be trash.
Babies, unlike farm animals, aren't normally used for food. So, applying the logic above, it wouldn't make economic sense to raise them just to burn them.
I hope this answers your question.