Fantastic article. I didn't realize dairy cows lactated ~60lbs/day or ~3.5% of their body weight. Totally insane. Chickens appear to be this way too -- from some quick research Rhode Island Reds are ~3kg, lay ~300 eggs/year and each egg is ~62g.

The graph at the end ("US milk yield continues to grow, but falls short of its genetic potential") is interesting. If I saw that graph, I would interpret it as dairy farmers overfitting on the genetic yield potential measure, not as something that needs explanations like climate change.