Table 4.

Effects of constant heat stress on enzyme activities of longissimus dorsi muscle in finishing pigs

Items	CON	H30	PF	SEM	p-value
Lactate (mm mol/g protein)	1.02b	1.52a	1.32ab	0.10	0.01
LDH (U/mg protein)	14.76	16.06	16.04	0.41	0.06
MDA (n mol/mg protein)	0.10C	0.13A	0.11B	<0.01	<0.01
SOD (U/mg protein)	11.84A	9.92B	9.97B	0.20	<0.01
CAT (U/mg protein)	0.49A	0.41B	0.48A	0.01	<0.01

CON, constant ambient temperature at 22°C and ad libitum feeding; H30, constant high ambient temperature at 30°C and ad libitum feeding; PF, constant ambient temperature at 22°C and pair-fed to the H30 diets; SEM, standard error of the mean; Lactate, lactate content in longissimus dorsi muscle (n = 8); LDH, lactate dehydrogenase activity in longissimus dorsi muscle (n = 8); MDA, malondialdehyde content in longissimus dorsi muscle (n = 8); SOD, superoxide dismutase activity in longissimus dorsi muscle (n = 8); CAT, catalase activity in longissimus dorsi muscle (n = 7).

^A,B,CTreatments with different superscript capital letters in the same row are different at p<0.01.

^a,b,cTreatments with different superscript low letters in the same row are different at p<0.05.