ARTICLE FEED & ADDITIVE MAGAZINE December 2022 59 of ingredients, harming the producer’s investment. Validated solutions, including blends of buffered organic acids, can help safeguard against microbial threats from raw ingredients through processing and storage. Organic acids protect against harmful bacteria and fungi by delivering a preservative benefit. But effective use of organic acids requires an understanding of their modes of action and how their combinations contribute to a feed safety solution. Distinct organic acids exert different properties that deliver variable effects against species of moulds. Additionally, the metabolic and absorption properties of various acids differ. Given that the properties exerted by individual organic acids differ and that the strengths of acidity per the pKa vary, a single organic acid cannot deliver the comprehensive approach required. Instead, a blend combining the properties of different acids is required to deliver a broad-spectrum effect against the various moulds and yeasts common in feed ingredients and finished feed. ASSURING SAFETY AT THE MILL The feed mill plays a big role in supporting feed safety, as ingredients undergo extreme thermal processes during feed production. While thermal conditioning and the application of steam can reduce contaminants in feed mass, these steps are not a panacea. Pelleting on its own may not be sufficient for killing mould spores. Moulds present a risk across all phases of production and feed treated at the mill can become recontaminated during transport or storage. Beyond reducing the microbial load in feed and feed ingredients, different organic acids can also support the longevity of feed safety interventions post production. But again, given the various contaminants and different modes of action exerted by organic acids, no single organic acid treatment can deal with such a complex matrix of safety challenges. Decades of intensive research led Selko to develop Fylax Forte-HC, a potent blend of buffered and non-buffered organic acids enriched with phytochemicals and moisture management agents. Fylax Forte-HC is a potent solution that delivers sustained feed safety benefits. Parameter ME (Kcal/kg) CP (%) Fat (%) Good corn 3410 8.9 4 Mouldy corn 3252 8.3 1.5% Loss in nutrients 158 0.6 2.5 Loss in nutrients (%) 4.6 6.7 62.5 Table 2. Temperature treatment alone does not fully remove fungal spores Types of fungal spores Aspergillus flavus Penicillium spp. The concentration of fungal spores 10² 104 106 10² 104 106 Percentage of killing at 55 °C for 30 minutes 34 32 30 41 37 32
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