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Two experiments evaluated the effects of cinnamaldehyde and garlic oil on performance of grazing (Exp. 1) and drylot beef cattle (Exp. 2). Treatments in both experiments consisted of daily supplement fortification with (CNG) or without (CON) cinnamaldehyde and garlic oil (300 mg/d). In Exp. 1, 24 cow-calf pairs were allocated into limpograss (Hemarthria altissima; n = 4) or bahiagrass (Paspalum notatum; n = 4) pastures, which were randomly assigned to treatments (4 pastures per treatment) until weaning. Thereafter, 24 weaned heifers were allocated into bahiagrass pastures (4 pastures per treatment) for 72 d. In Exp. 2, 20 Brangus steers were fed bahiagrass hay ad libitum and concentrate DM supplementation at 1% of BW for 30 d. Effects of forage type, treatment, and interactions were not detected for growth, fecal egg counts, and plasma glucose and urea nitrogen of heifers and cows (P ≥ 0.11). The fly counts …