If a plant is 60% by-product is 40% human edible product, and we give all the by-product to animals and all the edible parts to humans, then 60% of the crop weight goes to the animals, while 100% of the crop goes to both animals and human.
As it is, there are four primary ways corn is used as feed.
1: Is to take the entire plant and chop it up and turn it to feed.
2: After harvesting the cobs for human consumption, the stalks, leaves, husks can be turned into feed.
3: The remaining stalks and left over cobs can be grazed on.
4: byproducts for ethanol or other refining processes can be turned into feed.
The only one which is an actually problem here is the first one where the human edible part get turned into animal feed. As I understand it is also the most expensive feed. The linked source does not seem to define how large percent of the yields are used in this way.
If a plant is 60% by-product is 40% human edible product, and we give all the by-product to animals and all the edible parts to humans, then 60% of the crop weight goes to the animals, while 100% of the crop goes to both animals and human.
As it is, there are four primary ways corn is used as feed.
1: Is to take the entire plant and chop it up and turn it to feed.
2: After harvesting the cobs for human consumption, the stalks, leaves, husks can be turned into feed.
3: The remaining stalks and left over cobs can be grazed on.
4: byproducts for ethanol or other refining processes can be turned into feed.
The only one which is an actually problem here is the first one where the human edible part get turned into animal feed. As I understand it is also the most expensive feed. The linked source does not seem to define how large percent of the yields are used in this way.