Up to 86% reduction in Enterobacteriaceae load in ground grains

7 July 2016

A field trial showed how a feed additive treatment can efficiently reduce heavy loads of Enterobacteriaceae in ground grains


The grinding process of raw material might seriously affect its quality. The main reason is that the nutrients and moisture that were contained in the grains become more available after grinding, offering a rich substratum for microbial growth, such as Enterobacteriaceae and moulds. The risk increase is highly correlated with storage time, as the contamination will exponentially increment over time. To avoid the fast bacteria development- that will subsequently lead to feed contamination- the raw material needs to be treated with feed additives. This is of key importance to maintain feed quality, especially if the grains are going to be used for mash feed, which does not receive any heating treatment that could diminish the process.

A trial to asses grains’ quality after grinding

Trouw Nutrition conducted a test in order to determine the effect of grinding on the growth of Enterobacteriaceae in grains and how a liquid feed additive could help.

The trial was based on wheat and barley samples taken from a commercial feed miller. In the Selko service laboratory, the Enterobacteriaceae load of the samples was measured upon arrival. The grains were grinded and stored for 12 hours, and the same measurement was repeated.  The samples were then treated with a liquid feed additive- at a dosage of 3kg/t- and 24 hours later the Enterobacteriaceae load was measured again. Both times the samples were kept at room temperature in order to re- create the typical storing conditions at most feed mills.

The results at a glance

The grain samples were naturally contaminated with Enterobacteriaceae. These bacteria multiplied 11 times in barley and even 43 times in wheat 12 hours after grinding. The increased availability of moisture and nutrients previously enclosed in the grain explains this phenomenon.

The grains were then treated with a liquid feed additive, which resulted in a decrease of the Enterobacteriaceae load of 73% in barley and 86% in wheat, helping restore the good quality of the raw material and prevent feed contamination.

As the grinding process has such a dramatic effect in feed quality, treating raw materials to reduce their Enterobacteriaceae load is key for feed safety.

The product used in the trial

Fysal® liquid is a Selko feed additive. It’s  a synergistic blend of the most potent organic acids including their salts. It effectively reduces Enterobacteriaceae in both raw materials and compound feeds and has a long-lasting effect. The use of Fysal liquid results in safe feed materials for the animals and an optimal Enterobacteriaceae control throughout the complete feed to food chain.