To feed the world’s growing population, the animal feed industry will need more protein sources. Competition with human-edible proteins, pressure on agricultural land, sustainability and climate change are factors limiting the development of conventional protein sources. Therefore, alternative protein sources are needed to meet market demand. Yela ProSecure is a specifically designed hydrolysed yeast that offers great potential as a functional protein source, in particular thanks to its flash and fast kinetics of protein digestibility.
Protein digestibility of feed materials is important information for nutritionists, but it does not include timing of absorption in the gut. The kinetics of protein absorption should be considered, too. It allows us 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 categorise 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 1).
Figure 1- Kinetics of protein absorption: key parameters for protein functionalities.
Supplying animals with flash and fast digestible protein sources rich in free amino acids and small peptides will help them absorb and use those nutrients easily, and thus support animal performance, digestive health and feed appetibility while contributing to the feed-protein balance. This is particularly of interest when applied to the diets of young animals as their digestive tract is not yet mature.
Yeast is an incredible bioengineering factory and a source of valuable nutrients and functional molecules. Yela ProSecure is a specifically designed hydrolysed yeast born from Lallemand’s extensive yeast expertise.
Yela ProSecure’s kinetics of protein absorption have been analysed with the Boisen method (Figure 2). Yela ProSecure’s protein digestibility starts at 77% at the beginning of the intestinal phase (right after the stomach) and increases to 94% after 48 hours. Moreover, the product is close to its maximum in vitro digestibility after three hours of intestinal digestion, meaning that 90.5% of the protein content of the product has flash and fast digestibility kinetics. The proteins from Yela ProSecure are, therefore, highly bioavailable for the animals.
Figure 2- Yela ProSecure: kinetics of protein digestibility.
Based on the Boisen method, 8 feed materials were assessed for protein digestibility and kinetics of absorption (Figure 3):
Figure 3- Kinetics of protein digestibility of various protein sources.
Compared to these feed materials, the hydrolysed yeast product shows interesting kinetics of protein digestibility thanks to its well-controlled hydrolysis process, which makes the protein highly available and quickly absorbed. One direct result of that is a negligeable amount of non-digested protein reaching the lower gut.
In this high growth period, the synthesis and protein content in the gut is increasing at the same time as an important amino acid metabolism reshaping is happening. The requirement in arginine increases and the risk of shortage is real.
The systemic inflammation and associated infections sometimes related to the weaning lead to an increase in tryptophane, cystine and methionine as well as threonine.
At the same time, piglet diets evolve toward a reduction of the crude protein content, with the producer’s goal of maintaining animal growth performance. To achieve this goal, it is crucial to use highly digestible protein sources, which help reduce the crude protein content of the diet while maintaining the digestible protein levels associated with high functionalities for the animal.
Nutritionists are looking for highly digestible protein sources with fast kinetics of protein absorption, which supply free primary and secondary amino acids.
The hydrolysed yeast product from Lallemand helps manage dietary amino acids to optimise intestinal homeostasis, which is essential during stressful periods.
Hydrolysed yeasts are a promising and innovative functional protein source to consider, mainly driven by the free amino acids and the small peptides obtained from the cracking process of the protein. When the hydrolysis process is controlled, yeast bring a standardised profile of free amino acids, which plays a positive role in the maintenance of animal gut health, contributing to the feed protein balance and enhancing feed appetibility.