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Despite the fact that the neonatal period of calves comprises only a short time in their lives, this is the period of the highest incidence and mortality rates from diseases (16, 22, 35). Calf diseases are very important in terms of both economic and animal welfare concerns because they cause calf deaths, high treatment costs and low efficiency in animal performance (19). The goals of raising calves are health, performance, substitute heifer production and profitability. Investments made in line with these objectives play an important role in ensuring the profitability for livestock owners and businesses economically. Therefore, it is of great importance to prevent illnesses and to improve calf recovery rates by making early diagnosis in this period (24). During the neonatal period, colisepticemia, enterocolitis, rotavirus, coronavirus and cryptosporidiosis diarrhea are common in calves. Additionally, respiratory tract diseases are a problem observed during this period (13, 17, 21, 25). As with other animals, young newborn calves have a high incidence of disease. During the first 15 days in the calves’ lives, septicemia and diarrhea are the most common diseases, and it is the period when death is most commonly seen (1, 18, 22). Determination of routine clinical parameters to monitor the health status of animals is a practical method for early diagnosis of diseases (5, 6). It has been observed that the daily monitoring of cows during the postpartum period, a critical period in dairy cattle, is of great importance for the future of the herd (5). It is known that daily assessments are extremely important for calves (23). Passive transfer immunity is one of the most important factors affecting the health of the calves in the neonatal period (11, 27, 34). The passage of immunoglobulins during pregnancy is minimal because the placenta of ruminants is epitheliochorial, so the Early clinical predictors of diarrhea in the first fifteen days in dairy calves and their relationship with passive transfer status1)