In agreement with earlier reports about positive effects of dietary antibiotic administration, ADG of piglets and the G:F ratio were improved by apramycin in two of the three feeding phases of the present study
Regarding herbal feed additives, a wide range of spices, herbs, and extracts have been demonstrated to improve digestive tract function by increasing the activity of digestive enzymes of gastric mucosa and the nutrient utilization of livestock (Chrubasik et al., 2005 and Srinivasan, 2005). Lin et al. (2000) and Czech et al. (2009)