Increased pre-weaning gain rates have been shown to have positive effects on subsequent milk production. Feeding programs that can increase lean growth rate can provide economic benefits to both the calf operation and subsequent dairy production. Phytogenic feed additives (PFA) have been identified as natural growth promoters which can potentially replace antibiotic growth promoters. A feeding trial was conducted to test the performance of calves that received PFAs in both the milk replacer and the calf starter diets. Holstein calves were randomly assigned to one of 2 treatment groups, Control (Con) and Phytogenic (PFA). Two open-sided barns each containing 4 rows of 12 hutches were used. A total of 96 calves, 48 per treatment were enrolled in the study. Calves were received at the facility and began the trial between 2 and 3 d of age. Calves were fed for approximately 8 weeks. A commercial milk replacer was used. PFA calves received the same milk replacer as the Con diet with the addition of a commercial phytogenic product (Biomin USA.) at the rate of 0.1 mL per L reconstituted milk replacer. PFA calves received the same dry calf starter mash, but were supplemented with 300g/MT of a commercial phytogenic product (Biomin USA). Growth rate was determined based upon entry weight and weaning weight. Initial body weights differed. Because this was a commercial facility, calves were fed to similar final size, resulting in differing time on feed. Con calves initially weighed 40.9 kg while PFA calves initially weighed 38.7 kg (P = 0.041). As a result, initial calf weight and days on feed were used as a covariates in analyzing the data under PROC MIXED (SAS). Final body weights did not differ, Con = 76.6 kg and PFA = 78.2 kg (P = 0.385). Average daily gain did not differ 0.66 kg (Con) vs. 0.69 kg (PFA), (P = 0.24). Total weight gain was greater for the PFA group (39.2 kg vs. 36.0 kg (Con), (P = 0.009), but feeding period also differed, 54 d (Con) and 58 d (PFA), (P = 0.0003).