I agree with Peter here, that cattle are restricted to the Good Place because of their preferred herd beasts. I don't believe that cattle drop down dead or anything dramatic if they tried living on chaparral, but that their health would eventually suffer. RoC decribed farmers trying to raise sheep etc which sucumbbed to Hoof Rot and other diseases. This is the sort of thing that would get cattle, increased chance of disease, reduced milk, parasitic infection. IMO. I also think that the edge of chapparal is by no means a clear cut line, and even if it were then it would move from year to year, season to season.
Keith N
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