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It's like how chicken/fowl is the leanest meat and the least resource-intensive to cultivate, too.

I thought it was pigs due to their genetic defect that makes them unable to produce warmth from muscle contractions/shuddering? Why they also get comparatively fat and build nests, but save a lot of energy

For sustainability of livestock I'd look at feed conversion ratios: https://en.wikipedia.org/wiki/Feed_conversion_ratio#Conversi...

Chicken wins.

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