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I think it would be more useful to track weight produced. This statistic is probably hard to track...

A good proxy would be to multiply the number of animals by the Animal Unit Equivalents (AUE).

Calories could be a good measure - a whole chicken appears to be about 1200 and a cow between 500,000 and 600,000 - so a cow is about 500 chickens or so.

Calories is a great metric. Better than mass. However, what I really want to see is calories produced per a unit of time. It takes about 8 weeks to raise a meat chicken and about 80 for beef cattle. 1 Cow = 50 chickens.

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