Why only two years of milk production? Don't cows give milk for more years?https://twitter.com/DegenRolf/status/1034827287265521665 …
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Breeding might also be a factor. The quicker generational turnover, the bigger the annual genetic gains. If you can make 1% increase in breeding value per generation, and one herd turns over in 2 years and another turns over in 6 years...
Oh no :( Ugh. Is "per calorie" the right measure for daily life? How about "per dollar consumed" ?
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