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6.5 Are heavy metals (copper or zinc), probiotics, acids or enzymes effec­tive against Lawsonia intracellularis?

When added to the feed, none of these types of compounds has yet been shown to have any real effect on the Ileitis disease or its causative agent. The removal of many growth promoters from routine usage in European pigs in the last 10–20 years has corresponded with a rise in the usage of many of these types of compounds. This removal however has coincided with the increase of the prevalence of the disease in European farms.

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