ARTICLE FEED & ADDITIVE MAGAZINE May 2023 59 Supplying animals with a protein source that is already processed and rich in free amino acids and small peptides helps ensure better absorption in the gut. THE IMPORTANCE OF ABSORPTION KINETICS Protein digestibility of feed materials is an important information for nutritionists, but it is not expressing timing of absorption in the gut. The kinetics of protein absorption should be considered in addition to protein digestibility. It allows to nutritionists to properly assess the quality of the protein source. Many properties and functionalities of proteins are related to their absorption kinetics. The kinetics of protein absorption helps categorize the protein fraction according to its speed of absorption. Four categories can be defined as flash, fast, slow and resistant along the digestive tract (Figure 2). Flash digestibility is important for young animals, especially as their gut is not yet mature and still not able to easily absorb and utilize the protein fraction from the diet. Supplying young animals with a flash digestible protein source that is rich in free amino acids and small peptides will help them easily absorb and use those nutrients. HYDROLYZED YEASTS: A SOURCE OF HIGHLY DIGESTIBLE AND QUICKLY ABSORBED PROTEINS Yeast is an incredible bioengineering factory and a source of valuable nutrients and functional molecules. Yeast experts at Lallemand have worked on the screening of different yeast biomasses and on the optimization of their production processes, both of which led to the development of a specifically designed hydrolyzed yeast, YELA PROSECURE. YELA PROSECURE’s kinetics of protein absorption has been analyzed with the Boisen standard method (Figure 3). YELA PROSECURE’s protein digestibility starts at 77% at the beginning of the intestinal phase (right after the stomach) to 94% after 48 hours. Moreover, YELA PROSECURE is close to its maximum in vitro digestibility after 3 hours of intestinal digestion, meaning 90.5% of the protein content of YELA PROSECURE has flash and Figure 2. Kinetics of protein absorption: key parameters for protein functionalities Figure 3. YELA PROSECURE: kinetics of protein digestibility
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