TY - JOUR T1 - Effects of the high-flow modified to-and-fro anesthestic system on blood gas and respiratory rate in halothane anesthetized horses JO - Ciência Rural A1 - Natalini, Cláudio Corrêa A1 - Polydoro, Alexandre da Silva SN - 0103-8478 UL - 10.1590/S0103-84781997000400013 VL - 27 Y1 - 1997 PB - Brasil ER -