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The effect of heat stress on the endotoxin content and redox in the serum of dairy cattle

WU Xiu-qun,WANG Li-zhi(Animal Nutrition Institute of Sichuan Agricultural University,Sichuan Ya'an 625014,China)  
16 healthy Holstein cows were divided into the summer group(in August) and winter group(12 months),each treatment with eight repetitions,a cow each repetition.Summer,when the dairy cow-house temperature and humidity index(THI)72 up to 15 consecutive days,winter,when the cow-house THI72 up to 15 consecutive days,15 mL jugular vein blood was taken.Endotoxin level in plasma,Superoxide Dismutase(SOD),total antioxidant activity(TAP),glutathione peroxidase(GSH-Px) activity,and malondialdehyde(MDA) content in plasma were detected.The results show that:in summer,cow plasma endotoxin,MDA content highly increased significantly(P0.01),SOD activity highly decreased significantly(P0.01),TAP and GSH-Px activity decreased significantly(P0.05) in winter.
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