Of the total area that is used by humans (Agriculture, Urban and Built-up Land),
- urban and built-up land is 1m km²,
- agriculture is 48m km²,
so agriculture is 48 of 49 millions km² used, that’s 98%. The remaining 2% are all streets and housing and other infrastructure together.
Most of the corn cattle are eating is the stalk and husks. The stuff we’re going to grow regardless and would otherwise throw away.
Near slaughter when they get fattened up on feed lots (called finishing) it’s mostly cracked corn grain, it’s more towards the beggining of life that they’re fed roughage with only a small amount of supporting grain.