Oxidative stress will have adverse effects on animals, such as immunosuppression, slowing down animal growth, reducing production performance and causing organ damage. The main cell mediator is polymorphonuclear neutrophils (PMNs), and activated PMNs will Reactive oxygen species (ROS) are generated, and the secretion of ROS can cause lipid peroxidation, amino acid oxidation, protein cleavage, and DNA damage, thereby triggering a self-sustaining inflammatory cycle and oxidative stress. Therefore, both the release of ROS and the increase of PMN are responsible for the oxidation of the organism. Therapeutic strategies for oxidative cell damage include removal of specific toxic effector metabolites, augmentation of specific intracellular antioxidant systems, and the use of drugs with antioxidant activity. Phenolic compounds have redox properties and play an important role in neutralizing free radicals and peroxynitrites and decomposing peroxides, data on antioxidant activity are mainly through 2,2-diphenyl-1-picryl Chemical assay collection for hydrazine (DPPH) assay or lipid peroxidation. In vitro, thymol enhances antioxidant capacity by scavenging free radicals (figure 1). Thymol Cena and peroxy free radicals are prone to chemical reactions, and its hydrogen ions combine with free radicals to generate an intermediate product, phenoxy free radicals, which rapidly react with the next free radicals, thereby scavenging peroxy free radicals. Zhang Youlin et al.  studied the scavenging ability of thyme essential oil to free radicals by DPPH assay, and found that the scavenging ability of thyme essential oil to free radicals was linearly related to the concentration. The higher the concentration of thyme essential oil, the stronger the scavenging ability. certain antioxidant effect.
In vivo, it improves antioxidant capacity by increasing the activity of biological antioxidant enzymes (Figure 1). Güvenç et al. measured sperm quality parameters (motility, concentration, abnormal sperm, ratio of live and dead sperm) and biochemical parameters (reduced glutathione, malondialdehyde content and catalase activity, etc.), and performed histopathological detection The effects of different doses of Thymol Cena on sperm quality oxidative stress and antioxidant system were studied, and it was determined that the use of thymol could modulate enzyme activity, reduce oxidative damage, increase antioxidant levels in animals, and improve sperm quality parameters. However, it is not clear how thymol exerts its antioxidant effect. Some studies believe that plant essential oils contain certain antioxidant active substances that can improve the body’s antioxidant capacity, which can bind to cell surface receptors, through transcription and protein expression. The level increases the expression of antioxidant enzyme genes and enhances the activity of the body’s antioxidant enzymes, thereby improving the body’s antioxidant effect.