Effects of different levels of dandelion extract on growth performance,biochemical indexes,and immunity of broilers
The experiment aimed to investigate the effects of different levels of dandelion extract on the growth performance,serum biochemical indexes,and immune function of broilers.Two thousand healthy one-day-old AA broilers were divided into four groups,with 10 replicates per group and 50 broilers per replicate.The broilers in each group were fed experimental diets containing 0(control group),0.1%,0.2%,and 0.4%dandelion extract,respectively.The experiment lasted for 42 days.The results showed that compared to the control group,0.2%and 0.4%dandelion extract increased the body weight of broilers at 42 days of age(P<0.05).From 22 to 42 day,0.2%dandelion extract improved the average daily weight gain(P<0.05),while 0.2%and 0.4%dandelion extract reduced the feed to weight ratio(P<0.05).From 1 to 42 day,0.2%and 0.4%dandelion extract increased the average daily weight gain(P<0.05),and 0.2%dandelion extract reduced the feed to weight ratio(P<0.05).0.2%and 0.4%dandelion extract increased the levels of total protein and albumin in the serum(P<0.05),and reduced the levels of urea nitrogen,cholesterol,and triglycerides(P<0.05).0.2%dandelion extract decreased the activity of alanine aminotransferase and aspartate aminotransferase(P<0.05).Compared to the control group,0.2%and 0.4%dandelion extract increased the spleen index and thymus index of broilers at 42 days of age(P<0.05).Compared to the control group,0.1%,0.2%,and 0.4%dandelion extract increased the Newcastle disease antibody titer(P<0.05),and 0.2%and 0.4%dandelion extract increased the levels of immunoglobulin M,immunoglobulin A,and immunoglobulin G(P<0.05).The study indicates that adding an appropriate amount of dandelion extract to the diets can improve the growth performance,enhance the immune function,and improve the certain serum biochemical indexes.The suitable inclusion level of dandelion extract is determined to be 0.2%.
dandelion extractbroilersgrowth performanceserum biochemical indexesimmune function
万方数据
维普
