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and animal feed industries.

Feed for Thought

Feed Mill Management / Animal Feed Safety

Using synergy to save energy

December 14, 2012

To avoid salmonella in feed, the feed industry has developed both supply controls (although it's not always easy to reach 100%) and technology. With thermal treatment, you can decrease enterobacteria contamination to less than 2 log and kill all salmonella in the process plant. However, what about energy consumption?

This is one of the main reasons that drove the French energy saving agency Ademe to support Tecaliman on the Syttac study. From 2009 to 2012 they worked on salmonella control on feed by studying the synergy between technology and additives. A lot of information is now confirmed about the contribution of friction on the feed process (pig feed, which is less fatty than broiler pelletized feed, is cleaned at a lower temperature on the pellet mill). Syttac also showed that using acidifiers contributes to reduced energy consumption. This challenge is huge: a 5 degree Celsius temperature decrease during feed thermal treatment can cause as much as 30 percent increase in energy savings.

Several well-known brands contributed to the results by supplying propionic acid, formic acid, liquid sodium formate, calcium formate or calcium propionate. Each of them will surely communicate about those results. However, research is not finished regarding dosage and product composition. For example, there's no use including 16 kg of formic acid in a feed to avoid thermal treatment if animals will not consume the feed because of physiological inadequacy.

Anyway, this study proves that in some conditions, you can reduce enterobacteria pressure 3 log at 54 degrees Celsius and 4 log at 67.5 degrees Celsius. And decontamination with an acidifier might give a long lasting effect, reducing risk of recontamination after the process. This is great news for the long term war against salmonella.

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