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Salmonella Inhibited by Coarse Grinding, Diformate

by 5m Editor
21 January 2009, at 7:49am

GERMANY - Coarse grinding of the feed and potassium diformate as a feed additive have been shown to inhibit the growth of salmonella in pigs.

Agricultural production and the feed industry continue to suffer from losses caused by contamination with pathogenic bacteria and the associated consequences in livestock, such as reduced weight gain and increased mortality.

Under such conditions, acidifiers consisting of organic acids or their salts offer a promising strategy to maintain feed quality and inhibit the growth of pathogenic bacteria inside the animal, according to Addcon. The use of acidifiers has long been applied to both feed and food, where they prevent the growth of many microorganisms that reduce the nutritional quality and impair palatability, as well as cause infection.

A recent study (Ph.D. thesis from the University for Veterinary Medicine, Hanover, Germany in 2007) has demonstrated the potential of potassium diformate (Formi), in combination with coarse grinding of the feed, to inhibit the growth of salmonella in pigs. With this combination it was possible to lower the excretion of salmonella remarkably during the fattening period. The use of Formi during the grower phase, with the same feed texture, led to a significantly lower Salmonella prevalence in the Lnn. Ileocaecales.

Furthermore, the application of Formi to the diet resulted in statistically lower caecal pH-values as well as higher levels of propionate and butyrate in the caecum at slaughter.

Subsequent studies proved that the short-chain fatty acids propionate and butyrate – as stimulated by Formi inclusion in the diet – can inhibit the expression of invasive genes of Salmonella. Butyrate is known to stimulate intestinal epithelial cell function, including regulating gene expression. Higher butyrate concentrations in the distal part of the digestive tract, especially in the colon, also support the growth and development of epithelial cells in the gut, increasing villus length and crypt depth – factors that induce a healthy gut.

Formi contributes to an optimal gut microflora in the last part of the gastrointestinal tract of the pig via the promotion of butyrate production.

These results confirm that a healthy gut and food safety can be achieved by dietary means, says Addcon.