During the last decades, antibiotic growth promoters
have been widely used in the livestock industry due to
their excellent health and growth promotion properties.
However, owing to the decrease therapeutic effectiveness of
antibiotics for treatment of bacterial infection in humans,
the use of antibiotics as feed additives for livestock was
completely banned in the European Union in 2006. Therefore,
considerable efforts have been devoted towards developing alternatives to stabilize the health and growth performance
in livestock