What is the difference between dry matter and as-fed basis?

The distinction between dry matter and as-fed basis is crucial in understanding feed composition and nutrient calculation. The correct answer highlights that dry matter represents the feed's weight after removing the moisture content, thereby focusing solely on the nutrients present. In contrast, the as-fed basis includes the total weight of the feed, which comprises both the dry matter and the moisture.

When evaluating feeds, it is essential to be aware of moisture content as it can significantly influence nutrient density. For instance, a feed might appear to have a lower concentration of nutrients when evaluated on an as-fed basis due to the presence of moisture. Therefore, nutritionists often convert as-fed values to a dry matter basis for more accurate comparisons and assessments of nutrient profiles across different feeds.

In a broader context, understanding this difference aids in formulating diets, ensuring animals are receiving the intended nutrient levels without being misled by moisture content variations. This is particularly relevant when comparing feeds that may have vastly different moisture percentages, which would impact feeding decisions and overall animal nutrition strategies.