Feed efficiency

Farm animals eat, and they also produce food. Feed efficiency refers to the ratio of output (food) per input (feed).

There are a few ways to quantify outputs and inputs, such as

• total mass
• dry mass
• calories
• protein

Within each of those, one might also specify whether we're talking about

• all material, or
• just the proportion that is human-edible

Lastly, we could specify whether the inputs & outputs are

• over the full lifetime of the animal, or
• just during some particular time (such as a cow's months of lactation).

From this, there are technically 128 different ways to measure feed efficiency - which is way too much! This page is meant to be a table for the most important ones.

Numbers

This will be filled in soon.