Changes in urea and UA levels in response to heat stress. a After 2 h of heat stress, the urea levels were significantly higher in the Heat group than in the Aspirin group (**p < 0.01, ##p < 0.01). The Aspirin + Heat group had lower urea levels than the Heat group (##p < 0.01). The Aspirin group had lower urea levels than the Heat group at all time points (##p < 0.01). Lines indicate significant differences between the Aspirin + Heat and Aspirin groups. b After 1 h of heat stress, the UA levels were significantly higher in the Heat group than in the Aspirin group until 24 h of heat stress (**p < 0.01, ##p < 0.01). The Aspirin + Heat group had lower UA levels than the Heat group at all time points (##p < 0.01). Finally, the Aspirin group had lower UA levels than the Heat group at all time points (##p < 0.01). Lines indicate significant differences between the Aspirin + Heat and Aspirin groups