>>716471561
>>716469349
It's just propaganda for dairy farming.
By listing a vast amount of small items they can make it seem impressive how efficient the system is.
Most of these things are done because we just have an excess of cows sans meat.
Even if you can use the whole cow you still lose a tonne of energy in the process.

Also, not listed is how many cows we would need to effectively attain these items to a reasonable degree.