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A comment on Most U.S. Dairy Cows Are Descended From Just Two Bulls. Parent comment

Re:Most U.S. Dairy Cows Are Descended From Just Two Bulls by DiogenesKynikos on Friday October 18, 2019 @01:05PM (#21293082)
They're not absolutely essential, but they are very nutritious, which is why the lactose tolerance gene has been so heavily selected for.
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