AFAIK there is no human-grade soy vs. livestock-grade soy. But the soy grown for livestock can usually be fed in the ratio of <soy for one animal>:<soy for many

AFAIK there is no human-grade soy vs. livestock-grade soy. But the soy grown for livestock can usually be fed in the ratio of <soy for one animal>:<soy for many humans> (this ratio varies based on which animal and farming practice you consider).