Serum biochemistry and hormone analyses of (A) epinephrine (EPI), (B) norepinephrine (NE), (C) Ca2+/Mg2+-ATPase, (D) lactate dehydrogenase (LDH), (E) phosphofructokinase 1 (PFK-1), (F) hexokinase 2 (HK2), (G) pyruvate kinase M2 isoenzyme (M2-PK), (H) succinate dehydrogenase (SDH), and (I) citrate synthase (CS) in LW and MS pigs at 25 °C and 4 °C. The results are presented as mean ± SEM (n = 3). LW and MS refer to Large White pigs and Mashen pigs, respectively; 25 and 4 refer to 25 °C and 4 °C, respectively. p values were determined using the two-tailed unpaired Student’s t-test, ** p < 0.01; * p < 0.05.