Phytobiotics have gained increasing interest as natural growth promoting
feed additives in broiler production in recent years. Nevertheless, knowledge on
modes of action as well as aspects of application are still rather limited (Windisch
et al., 2009). Furthermore, original plants included in phytobiotic products vary
widely in their composition and content of active ingredients making it difficult to
estimate the mode of action. Some actions may only be possible when a defined
combination of ingredients is available.