Table 3.

Effect of different stocking densities on blood electrolytes (mmol L${}^{-\mathrm{1}}$) in meat ducks exposed to heat stress.

	Treatment groups
Items	CON	LSD	MSD	HSD
Sodium (Na${}^{+})$	136.7 $\pm$ 0.51${}^{*,\mathrm{c}}$	152.3 $\pm$ 0.33${}^{\mathrm{a}}$	151.6 $\pm$ 0.72${}^{\mathrm{a}}$	147.6 $\pm$ 1.22${}^{\mathrm{b}}$
Potassium (K${}^{+})$	3.15 $\pm$ 0.23${}^{\mathrm{c}}$	4.58 $\pm$ 0.11${}^{\mathrm{a}}$	4.64 $\pm$ 0.14${}^{\mathrm{a}}$	4.10 $\pm$ 0.06${}^{\mathrm{b}}$
Chloride (Cl${}^{-})$	132.7 $\pm$ 1.03${}^{\mathrm{c}}$	113.7 $\pm$ 1.76${}^{\mathrm{a}}$	114.7 $\pm$ 1.20${}^{\mathrm{a}}$	106.7 $\pm$ 1.75${}^{\mathrm{b}}$

${}^{*}$ Mean values $\pm$ standard errors ($n=\mathrm{15}$). ${}^{\mathrm{a},\mathrm{b},\mathrm{c}}$ represent significant differences among treatment groups at a confidence level of 95 % ($P\mathit{<}\mathrm{0.05}$).