Aimed to evaluate creatine kinase MB (CK-MB) and cardiac troponin I (cTnI) in goats with experimental ruminal lactic acidosis (RLA) and supplemented with monensin sodium (MS). Twenty goats were divided into control group (CG) and treatment group (TG) supplemented with 33mg/animal/day of MS. The RLA was induced (10g/Kg body weight of sucrose) and before and post-induction clinical data, ruminal fluid and blood were collected. All animals presented mild RLA, with minimal ruminal pH at 8h post-induction. CK-MB and cTnI were higher in the CG and TG, respectively, without differ between moments. MS at the dose used did not prevent RLA whose severity was not sufficient to cause cardiac injury.

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