The article emphasizes the crucial role of gut microbiota in bovines for nutrient absorption and immune response, noting that the bovine gastrointestinal tract is colonized by bacteria shortly after birth. Disruptions in this microbiota can lead to health issues and reduced metabolic and immunological functions. Probiotics, particularly those based on lactic acid bacteria (LAB), are highlighted as beneficial for modulating the microbiota and enhancing health and growth in dairy calves. A study in Mexico found that administering LAB-based probiotics to newborn calves improved their growth rate and gut microbiota profile, with more frequent administration in the first 20 days potentially yielding even better results. Supplementing calves with two strains of Lactobacillus resulted in higher weights post-milk feeding and during the first five months, likely due to positive changes in the intestinal microbiota.