You should consider the following:

1. The human body can synthesize protein except for a few amino acids. These are called "essential" amino acids because we must get them from food.

2. Protein "quality" refers to the ratio of essential amino acids, specifically how close they are to the ratio of essential amino acids in our bodies. This metric is used to gauge the rate of absorption of proteins, not the overall amount of absorption.

3. Red meat is not ideal protein quality. Whey protein is actually a lot better because it consists of amino acids in ratios that are better for absorption. Also better than red meat is... rice and beans.