Not really. Go outside into the woods and try and generate sufficient biomass to feed yourself off ants. You can't do it. You will starve before you figure out a solution. Or, you chuck that stick at that 200lb deer and you now have like 100,000 calories worth of venison to live off of.

Animals are expert foragers. A deer can get to 200lbs or more eating what a deer tends to eat just fine. You will struggle to forage like a deer in that same environment, but you can coopt the deer's superior foraging abilities by simply eating it. And if you have a herd of animals you shepherd, not only are they making use of biomass you can't yourself make use off, but they are acting as a store of biomass keeping it fresh and available until you decide to cull some of the herd.