夏季日粮中添加酵母硒对产蛋后期蛋鸡 生产性能、蛋品质、血常规及抗氧化功能的影响

The experiment was to study the effect of selenium yeast supplementation on production performance, egg quality, blood routine and antioxidant function of laying hens in late laying period. A total of three hundred and sixty 420-day-old laying hens were randomly divided into four groups, with three replicates in each group and 30 laying hens in each replicate. Laying hens in control group were fed with a basal diet, and hens in experimental group Ⅰ, group Ⅱ and group Ⅲ were fed with basal diet supplemented with 0.1%, 0.2% and 0.3% selenium yeast, respectively. The experiment lasted for 60 d. The results showed that compared with control group, the eggshell thickness of group Ⅰ, group Ⅱ and group Ⅲ was extremely decreased (P<0.01). The number of platelets in blood of laying hens in group Ⅱ and the mean corpus-cell hemoglobin content in blood of laying hens in group Ⅲ were significantly decreased (P<0.05). The white blood cells of laying hens in group Ⅱ, and the MCH of laying hens in group Ⅱ and group Ⅲ were extremely decreased (P<0.01). The mean red blood cell volume of laying hens in group Ⅰ and group Ⅱ was significantly increased (P<0.05). The content of total superoxide dismutase and hydroxyl radical in serum of laying hens in group Ⅰ were extremely increased (P<0.01), and the activity of glutathione peroxidase in serum of laying hens in experimental groups was extremely increased (P<0.01). Serum malondialdehyde of laying hens in group Ⅰ was significantly decreased (P<0.05). The experiment indicates that adding selenium yeast to diet can maintain blood homeostasis and stable redox of laying hens, and alleviate the damage caused by high temperature in summer, the supplementation of 0.1% selenium yeast has better effect. [ABSTRACT FROM AUTHOR]