Enteral hydration in cows: Comparison between continuous flow and bolus administration.

Abstract

Enteral hydration in cattle is most commonly performed as a bolus (B) via the ororuminal route, although continuous flow (CF) administration via the nasoesophageal route represents a viable alternative. Currently, no study has compared the effectiveness of these two methods. This study aimed to compare the efficiency of enteral hydration using CF and B to correct water, electrolyte and acid-base imbalances in cows. Protocols for the induction of dehydration were applied twice to eight healthy cows, with an interval of 1 week. In a crossover design, two types of enteral hydration were performed using the same electrolyte solution and volume equal to 12% of bodyweight (BW): CF (10mL/kg/h, between 0 and 12hours) and B (6% BW, twice, at 0 and 6hours). Clinical and blood variables were determined at -24, 0, 6, 12 and 24hours and compared using repeated-measures ANOVA. Induced moderate dehydration and hypochloremic metabolic alkalosis were corrected after 12 hours using the two hydration methods, with no differences observed between the methods. The study was conducted with induced rather than natural imbalances, so the findings should be interpreted cautiously. Enteral CF hydration is as effective as B hydration in reversing dehydration and correcting electrolyte and acid-base imbalances.