Enteral electrolyte solutions with different osmolarities administered in a continuous flow in newborn calves/Solucoes eletroliticas enteral com diferentes osmolaridade administradas em fluxo continuo em bezerros recem-nascidos

This study compared the effects of enteral electrolyte solutions with different osmolarities in Holstein cattle. Eighteen newborn calves were evenly divided into three groups and administered the following treatments: hypotonic electrolyte solution (ESHYPO) containing 4g NaCl, 0.5g KCl, 1g sodium acetate, and 7.5g dextrose diluted in 1,000mL water; isotonic electrolyte solution (ESISO) containing 5g NaCl, 1g KCl, 2g sodium acetate, and 10g dextrose diluted in 1,000mL water; and hypertonic electrolyte solution (ESHYPER) containing 6g NaCl, 1g KCl, 3g sodium acetate, and 15g dextrose diluted in 1,000mL water. Solutions were administered at a rate of 15mL [kg.sup.-1][hr.sup.-1] for 12 hours in a continuous flow. All three solutions increased the concentration of plasma sodium, but ESHYPO did not alter the serum osmolarity. Both ESISO and ESHYPO resulted in an increase in volemia. Key words: fluid therapy, calf, hypotonic solution, nasogastric tube. O presente estudo comparou os efeitos de solucoes de eletroliticas enterais com diferentes osmolaridades administradas em fluxo continuo. Dezoito animais foram divididos em tres grupos: Solucao eletrolitica hipotonica (SEHIPO) contendo 4g de NaCl; 0,5g de KCl; 1g de acetato de sodio; 7,5g de dextrose diluidos em 1.000mL de agua; Solucao eletrolitica isotonica (SEISO) contendo 5g de NaCl; 1g de KC 2g de acetato de sodio; 10g de dextrose diluidos em 1.000mL de agua; A solucao eletrolitica hipertonica (SEHIPER) contendo 6g de NaCl; 1g de KCl; 3g de acetato de sodio; 15g de dextrose diluidos em 1.000mL de agua. As solucoes foram administradas na dose de 15mL[kg.sup.-1]26[h.sup.-1] durante 12 horas. Os tratamentos SEHIPO, SEISO e SEHIPER aumentaram a concentracao plasmatica de sodio, contudo apenas a SEHIPO nao ocasionou alteracao na osmolaridade serica. As SEHIPO e SEISO aumentaram a volemia. Palavras-chave: hidratacao, bezerro, solucao hipotonica, sonda nasogastrica.