Cows eat grass. Humans use more calories digesting grass than they gain from eating grass, so cows are infinitely more efficient than humans at gaining calories from grass.
And there are places in the world where growing human food would destroy the land. Semi-deserts like Texas and Montana. Grazing cattle there is a good idea. Bison would be even better because the native prairie there is adapted to bison, but cattle are a close substitute.
But we eat a lot more cattle than Texas & Montana can support.
And there are places in the world where growing human food would destroy the land. Semi-deserts like Texas and Montana. Grazing cattle there is a good idea. Bison would be even better because the native prairie there is adapted to bison, but cattle are a close substitute.
But we eat a lot more cattle than Texas & Montana can support.