Effects of dietary essential oil supplementation and Eimeria challenge on fecal oocyst output. None: unchallenged broilers received aliquot of dilution at d 10. Challenge: challenged broilers received sporulated 104 oocysts of E. tenella, E. acervulina, and E. maxima at d 10. Control: a corn and soybean meal basal diet, anticoccidial: control diet + 60 g nicarbazin and 60 g narasin per ton of feed, oregano: control diet + 500 ppm oregano oil, and clove: control diet + 500 ppm clove oil. Fecal samples were taken prechallenge and 8 d postchallenge with 12 and 6 replicates per treatment, respectively. A, BCapitalized subscripts noted the major effects of Eimeria challenge and diet on fecal oocyst output.