In order to evaluate the additive r-zeta® (Zorion US LLC) included in pelleted feed to regulate intake, an experiment was carried out at INTA in Concepción del Uruguay with 48 British calves. They were weaned at 4.1 months of age and 110.6 kg LW and were distributed into four treatment groups (two repetitions/treatment, six calves/repetition): Control + hay: daily supply of pelletized feed + alfalfa hay (ratio: 80:20); Control: daily supply of pelletized feed; SF + hay: self-feeder with pelletized feed with r-zeta® additive + daily supply of alfalfa hay independently (20% of the estimated daily consumption); and SF: self-feeder with pelletized feed with r-zeta® additive. In all cases, the balanced pelletized feed was formulated to be an isoprotein and isoenergetic. The additive composition consists of specific flavorings for ruminants that regulate intake, products that minimize thermal stress, enzymes, microorganisms that modulate the microbiota, liver protectors and anti-inflammatories. In the control groups, 1% of the LW initial feed was offered, and the food supply was gradually increased until a remainder was obtained after 24 h. The weight of all animals was recorded at 7-day intervals to determine the ADG and the TKG. The dry matter intake (DMI) and feed conversion ratio (FCR) were estimated. The ADG was similar between treatments (1.2 kg/animal); however, the TKG was higher for the SF treatment compared to the Control + hay treatment (81.5 vs. 68.8 kg/animal, respectively). The calves presented similar daily intake, but the intake as a function of the LW (%) was lower in the Control group (2.9 vs. 3.2 % LW). The conversion was better in calves fed with SF compared to Control + hay and SF + hay (3.1 vs. 3.7 kg DM/kg LW). The inclusion of the r-zeta® additive in the pelletized feed allowed for the early weaning of calves without adaptation protocols or the use of hay.