What is the Pearson's Square used for in feed formulation?

• A. Predicting growth in animals
• B. Balancing nutrient content in feed
• C. Measuring moisture in ingredients
• D. Determining color of feed

Answer: (B)

The Pearson’s Square is used to balance a nutrient in a feed by blending two ingredients that have different levels of that nutrient to hit a desired level in the final mix. You start with the nutrient content of two ingredients and the target content for the mixture. By subtracting the target from the higher ingredient value and subtracting the lower ingredient value from the target, you get two differences. The proportions of the two ingredients in the mix correspond to these opposite differences. This lets you calculate how much of each ingredient to combine to achieve the desired nutrient level.

For example, if one ingredient has 30% protein and the other has 10% protein, and your target is 20% protein in the final feed, the differences are 30 − 20 = 10 and 20 − 10 = 10, so you’d mix equal parts of the two ingredients. If your target were 22%, the differences would be 30 − 22 = 8 and 22 − 10 = 12, meaning you’d use more of the lower-protein ingredient to pull the blend toward 22%.

This method focuses on a single nutrient at a time and is most straightforward when you’re balancing two ingredients. It’s not about predicting growth, measuring moisture, or assessing color; it’s a simple way to achieve the desired nutrient concentration in the final feed.