The effect of inclusion in drinking water, either
singly or alternating, of oregano oil and a probiotic
Enterococcus faecium strain on performance of growing broiler chickens

The hypothesis of this study was that the inclusion of oregano oil and a probiotic Enterococcus faecium strain in drinking water, either singly or alternating, would improve growth performance of broiler chickens during a 42-day growth period. One-day-old Ross 308 chicks (mixed sex; mean body weight 45.1 g (standard deviation 1.04 g) were randomly assigned to four experimental groups at the start of the experiment: control (without supplement), probiotic (continuous supply of an E. faecium commodity [minimum activity per kg: 3.3 × 1012 colony forming units] with drinking water at 200 mg/L), oregano oil (75,000 mg/kg of product; first three days of each week at 0.2 mL/L drinking water), and oregano oil-probiotic (addition of oregano oil...