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A comment on Replacing butter with vegetable oils does not cut heart disease risk (2016). Parent comment

Re:Replacing butter with vegetable oils does not cut heart d... by philipcristiano on Monday February 13, 2017 @08:16AM (#13634957)
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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