Excessive use of antibiotics over the last few decades has led to the current legislation whereby antibiotic use in animal production should be rationalized. As a first step, Antibiotic Growth Promoters (AGPs) were banned from use within the EU (Bengtsson and Wierup, 2006). Use of non-antibiotic growth promoters has been rising as a result of the pressure to maintain a cost effective and economical animal production. Due to consumer demand, such pressure escalated to total reduction of antibiotic use in farm animals destined for human consumption.
It is critical to develop cost effective antibiotic alternative strategies to ensure the long-term sustainability of animal production (Cheng et al., 2014). Although extensive research has been carried out on ingredients that exert antibacterial effect individually, less work has been done to understand how multiple ingredients may work in combination.