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Effects of selected herbs and essential oils, and their active components on feed intake and performance of broilers - a review

Summary

Since the EU banned antibiotic growth promoters in broiler nutrition, much research has been conducted to explore the use of possible effective substitutes. One possibility is the application of herbs or their essential oils (EO). Numerous in vitro studies have already confirmed the antibacterialactions of these feed additives. Consequently, several in vivo studies were performed to confirm their beneficial qualities. Performance variables that were dominantly observed and analyzed are feed intake, body weight gain and feed conversion ratio. Most of the trials showed slight positive effects, however significant results were rare. Since there are almost unlimited possibilities concerning dosage and combinations of herbs and EO there is still more research needed. A lack of standardization leads to difficulties when it comes to comparing results. One major factor in this concern is the varieties of active components. Chemical composition depends significantly on variables like plant species, physical and chemical soil condition, harvest period, stage of maturity at harvest, technology of drying, duration of storage and extraction process. Therefore, it is necessary to define and declare the composition of the feed additive used in experiments. Generally, it can be stated that herbs and EO have the potential to be considered as an alternative to antibiotic growth promoters inbroiler nutrition. Nevertheless, there is still further researchunder more standardized condition needed to evaluate the right dosage and combination as well as the exact mechanism of actions.

german version

Keywords/Stichworte:Herbs; essential oils; performance; broilers

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