Earlier quoted context omitted.
> When you eat an animal, you are consuming (in this analysis) all nutrients it has consumed over its entire life, of which 90% are wasted vs. just eating those nutrients yourself. Most of those nutrients you, as a human being, either can't eat at all or get nothing from. Humans can't feed on hay and silage.
Yeah, and the vast amounts of land used to grow those things can be redirected to other things that humans can eat. I have no idea why otherwise smart people get such a brain block on the topic of meat-eating. These "gotcha" points fall apart if you take 10 seconds to think about it.
One easy thought experiment that helped me understand: given how extremely poor our ancestors where and how hard they worked to make ends meet there must have been some advantage to keeping animals.
Otherwise they wouldn't have had them, because they are sometimes a real hassle and gathering food for them is time consuming I can tell you.
So maybe your idea would work in a more temperate climate. And maybe it would provide extra food for people further north, but it would mean a lot of land that cannot be used for anything but pastures would go out of use.