The decreasing trend of the concentrations of Na + , K + and HCO 3 − was highly significant at the age of 35 days ( P < 0.01) but the decreasing trend of the concentrations of each ion at the age of 42 days was alleviated ( P < 0.05).
The impact of heat stress on serum ion concentrations The results of serum ion concentrations demonstrated that in comparison to the TN group, the serum concentrations of Na + , K + , Cl − and HCO 3 − in the HS group all demonstrated a decreasing trend after heat stress, of which the difference in the concentration of Cl − was not significant ( P > 0.05).