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Why would they BOTHER USING it if it were non toxic? The whole point is to KILL THINGS!
Frankly there is not *that* much diversity in biochemistry and cell metabolism among different kinds of life on earth. There are really not many cases where a substance kills one kind of critter effectively while being genuinely completely harmless to other kinds of critters. In reality, it's just a matter of differing sensitivities. But just because a pesticide doesn't *kill* nontarget species does not mean it is genuinely completely harmless to them. E.g., to US.
I mean, just look at the long list of pesticides (herbicides, insecticides, fungicides, etc) that have been accepted as safe in the past but that are now documented to cause serious, just harder to notice because *chronic*, harm to other critters including us.
It would be foolish to assume that list is not going to be added to further, from things that today are legally permissible.
Glyphosate itself is not especially toxic -- the guy who invented it apparently used to occasionally *drink* it as a rhetorical stunt to argue for its safety -- HOWEVER Roundup and other commercial glyphosate preparations have a whole slew of (proprietary, and thus secret and undisclosed) other ingredients added to 'improve' the effectiveness of the product, and it has been pretty well documented that in real world conditions
Roundup is more long-lived and more toxic than pure glyphosate alone.
Me, I would not be letting any of my animals (or kids either) onto land where Roundup or its kin were sprayed, for at
least a week and a rainstorm after the spraying. And then I'd be cautious about eating anything that'd been grazing those pastures for some longer time frame. That said, eating eggs from your chickens is not going to kill you and probably (
probably) would not have any meaningful effect on your overall life expectancy.
(edited to add: raw soybeans in large amounts are mildly toxic, both directly and in terms of decreasing absorbtion of other nutrients from feed. I do not know how much is left in the field after harvesting and I do not know offhand the dose that it takes to produce symptoms in chickens -- although I believe the latter information does exist, try googling thoroughly something like 'soy toxic chickens amount'. Certainly *some* raw soybeans, particularly if it's just for a short period of time, is basically ok... but you migth want to research the details more, before harvest time)
JMHO,
Pat