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The objective of this study was to evaluate in bovines, the average comparison of the infusion speed of two isotonic solutions of commercial brands (NaCl Solution 0.9% and Ringer Solution with lactate), through the intraperitoneal infusion technique. The experiment was conducted at the PlanFelix site in the city of Assaí - PR. The activities of the experiment were performed on a single day in March 2018, with five repetitions, being selected ten cows, randomly drawn and divided into two experimental groups, where those with even numbers were evaluated in the morning and those with odd numbers in the afternoon. Through intraperitoneal infusion, one group received three liters of 0.9% NaCl solution, and the other received three liters of Ringer Lactate. The statistical design was entirely randomized. The models were analyzed using Rstudio software (version 3.0.3), with a significance level of 0.05. All variables found were submitted to descriptive and variance analysis and the means of treatment were compared in Tukey's test. It was concluded that the mean intraperitoneal infusion speed for 3 liters of 0.9% NaCl solution and lactate Ringer in the experiment did not have significant difference between the treatments; the mean time proved efficient for application in cattle in the field; these fluids can be safely administered under these conditions and by the evaluated technique, because no adverse reactions and post-treatment changes were found. [ABSTRACT FROM AUTHOR]