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This study analyzed the effect of protein salt supplementation on the normalized weight of replacement heifers at the El Ejido Experimental Station, Los Santos, Panama, between 2015 and 2017. Thirty Brown Swiss x Zebu crossbred heifers were used, with an average initial weight of 204 kg, managed in a rotational grazing system with Brachiaria decumbens and B. brizantha. A factorial experimental design was implemented that considered two climatic seasons (dry and rainy) and an analysis of variance (ANOVA) was performed to evaluate the effect of supplementation on the normalized weight. The results showed a significant effect of protein salt supplementation on the normalized weight of the heifers (p < 0.001). The variable "year" influenced growth (p < 0.001), while the "season" had no significant impact (p = 0.302). This study highlights the importance of protein salt supplementation to optimize the growth of replacement heifers in similar livestock production systems.