SPECIAL STORY 54 FEED & ADDITIVE MAGAZINE August 2022 REDUCING THE RISK OF E. COLI When looking in more detail to the microbiota of the broilers, it becomes evident that also lower counts of pathogenic E. coli were found when FRA® Butyrin Hybrid Dry was administrated to the diet. A significant reduction of even 51.4% was observed in the ileum and a near significant reduction of 36.5% in the jejunum (see Figure 5). Together with the data from the cecum, it proves that FRA® Butyrin Hybrid Dry balances the microbiota to a state with more beneficial bacteria and less potential harmful bacteria in broilers under heat stress, which could be one mechanism leading to better broiler performance. CONCLUDING REMARKS More and more evidence becomes available about heat stress damaging gut integrity and microbiome balance in broilers. The good news, however, is that dietary inclusion of butyric acid in the form of FRA® Butyrin Hybrid Dry for heat-stressed broilers could be an effective nutritional tool to alleviate the detrimental effects of heat stress to the broilers’ gut. Not only was the innovative feed additive in this recent FRAmelco-trial able to improve growth performance, it also showed a favourable effect on gut health and microbiota balance, which might be the reason for the higher growth efficiency and improved profitability. Figure 4. The effect of FRA® Butyrin Hybrid Dry on caecal bacterial counts (CFU/ml) in broilers under heat stress conditions at 42 days of age. abBars with a different superscript are significantly different (p≤0.05). Figure 5. The effect of FRA® Butyrin Hybrid Dry on E. coli (CFU/g) under heat stress conditions in broilers. abBars with a different superscript are significantly different (p≤0.05); or xy near significantly different (p≤0.10).
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