This experiment was conducted to study the effects of dietary adding selenium-enriched yeast in summer on weight, blood routine, serum biochemical indexes and serum antioxidant function of Wandong cattle. Thirty healthy fattening beef cattle with the similar age and weight were randomly divided into control group, trial group Ⅰ and trial group Ⅱ, with 5 replicates in each group and 2 heads per replicate. Cattles were fed a basic diet, and 10 and 20 g of selenium-rich yeast were separately added to each cattle of the diet in trial group Ⅰ and trial group Ⅱ. The weight of the beef cattle at the beginning and end of the trial was measured. Blood was collected from the jugular vein to determine the blood routine indexes, and isolated serum to determine the indexes of biochemistry and antioxidant at days 15, 30 and 45. The results showed as follows: 1) there was no significant effect on final weight among groups (P>0.05). 2) Compared with trial group Ⅰ and the control group, the number of white blood cells and monocytes in trial group Ⅱ were significantly increased at days 15 and 30 (P<0.05 or P<0.01). The number of lymphocytes in trial group Ⅰ was significantly lower than that in trial group Ⅱ and the control group at day 15 (P<0.01) and was significantly lower at day 30 (P<0.05). The number of neutrophils in trial group Ⅱ was significantly higher than that in the control group at day 15 (P<0.05). The hematocrit and mean hemoglobin concentrations in trial group Ⅰ were significantly different from those in other groups at days 15 and 45 (P<0.05 or P<0.01). 3) Compared with the control group, the total bilirubin content in serum in trial group Ⅱ was significantly increased at days 15, 30 and 45 (P<0.05). The content of serum urea in the trial group Ⅱ was significantly lower than that in trial group Ⅰ and control group at day 30 (P<0.01). 4) Compared with the control group, the serum total antioxidant and the activity of glutathione peroxidase in the trial group Ⅰ and trial group Ⅱ were significantly increased at days 15, 30 and 45(P<0.05 or P<0.01). The activity of superoxide dismutase in the trial group Ⅰ and trial group Ⅱ were significantly higher than those in the control group at days 15 and 30 (P<0.05 or P<0.01). 5) Compared with the control group, the content of serum hydroxyl radicals in trial group Ⅰ was significantly decreased at day 15 (P<0.05), and the content of serum hydroxyl radicals in trial group Ⅱ was significantly decreased at day 30 (P<0.05). Compared with the control group, the content of serum malondialdehyde in the trial group Ⅰ and trial group Ⅱ was significantly lower at days 30 and 45 (P<0.05). Totally, the addition of selenium-rich yeast to summer diet significantly increases the immune cell content of Wandong cattle, which is conducive to improve the body’s immunity. Otherwise, it enhances the antioxidant capacity of serum significantly, which is conducive to maintain the healthy state of the body in the summer. Thus, the appropriate dose of selenium-rich yeast can be used as a summer diet additive to maintain the healthy state of beef cattle.
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