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philipcristiano
on Feb 13, 2017
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Replacing butter with vegetable oils does not cut ...
Cows can live that long but after production drops (about 4 years) they will be sold off for beef. Not breeding cows would definitely help.
https://en.wikipedia.org/wiki/Dairy_cattle
lists a few sources for the 4 years figure.
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Search:
https://en.wikipedia.org/wiki/Dairy_cattle lists a few sources for the 4 years figure.