Impacto do jejum prolongado no equilíbrio ácido-base e eletrolítico em bezerros

Abstract

The danger of regurgitation and aspiration of rumen contents associated with general anesthesia is common in ruminants, even when these animals are fasted. Physiologically, the rumen is not emptied within 24 hours, on the other hand, the literature recommends the same period of fasting for the species, before any surgical intervention. Hemogasometry, together with the measurement of specific electrolytes, uses advanced methods to evaluate the acid-base and electrolyte status of an animal, being important for diagnosing various diseases. However, studies related to fasting, regurgitation, acid-base imbalance, electrolyte balance and their impact on cattle are scarce. Therefore, this study aims to evaluate possible changes in the electrolyte and acid-base balance of calves by comparing food fasting times of zero, 24 and 48 hours and water fasting times of 24 hours. For this, nine crossbred calves were used, with an average weight of 92 ± 12.5 kg and an average age of 3 months, which were housed in stalls at the Veterinary Hospital of the Federal University of Uberlândia. Among the parameters evaluated, only potassium, ionized calcium, glucose, lactate, pH, partial pressure of oxygen in venous blood, partial pressure of carbon dioxide in venous blood, bicarbonate, oxygen saturation in venous blood and temperature are included. Based on the results obtained in this study, it was possible to conclude that fasting for 24 and 48 hours did not have a significant impact on most electrolyte and acid-base parameters evaluated in ruminants.