INTERVIEW F&A Alternative Proteins Edition April 2023 15 What waste can the animal nutrition industry consider as an alternative feed or feed ingredient within the scope of the circular economy model? This question does not have a simple answer. If we were to list all possible by-stream candidates that can act as feed ingredients, we would need many more pages. As a rule of thumb, all pure by-products containing substantial levels of carbohydrates, protein or fibre can be suitable candidates. Some examples of companies we have partnered with over the years are (global) beer brewers, utilising spent yeast and spent grains, pulses and grain processors, utilising pea cream and starch-rich by streams, animal slaughter facilities, utilising process water, and the dairy industry, utilising whey and permeate. In all these examples, preserving ingredients in a cost-effective and safe way has been on a caseby-case basis relying on customised inclusion and application of Selko's Revalet product range. The best results are achieved through applying products at the right time and with the best possible dispersion. Selko offers state-of-the-art dosing services that allow for safe, accurate and reliable application of products. Considering that most of the wastes are foods that start to rot and spoil, we cannot ignore the fact that they are contaminated by different microorganisms. Therefore, how can we protect and transform these wastes in a way that does not pose a risk to human and animal health? It is indeed correct that by-products and other residual streams are exposed to microbial challenges when left untouched. Especially in liquid or moist products we see challenges with yeast or Enterobacteria, and in some cases even both. Within hours, yeast and microbes can significantly decrease nutritional value and produce vast amounts of CO2, making them dangerous to process or store and rendering them unfit for animal feeding. Next to microbial pressure, there is also an increased risk of mycotoxins, especially in grain by-products like DDGS, maize gluten meal or rice by-products. Most mycotoxins are present on the outer parts of the kernel. As the core is removed, the overall mycotoxin concentration in these by-products can reach levels that can harm animal health and performance. Figure 2. Effective preservation of by-products is key when working in an infinite economy.
RkJQdWJsaXNoZXIy MTUxNjkxNQ==