Study On The Effects Of Super Fine Astragalus Particles On Chicken's Immunologic Function

In this research, the super fine astragalus particles were added into the chicken'diet, drinking water and oil emulsion inactivated vaccine against Newcastle Disease. And the crude astragalus particles were added into the chicken'diet. Then the effects of super fine astragalus particles on the immune function of chicken was investigated by measuring the body weight of chicken, the weight and the index of immune organs (spleen, chest gland, bursa.), the immunity to the Newcastle Disease and the total number of E. coli.In this trial, a total of 300 one-day-old healthy Hailan Brown layers were chosen as the animal model. This trial was designed by single factor analysis of variance. All chicken were assigned into 5 groups at random, one was the control, and the others were the experimental groups. Each group had three repetitions, 20 chickens in each repetition.At the age of 7d, 14d, 21d, 28d, 35d, 42d, 10 chickens were picked out from each treatment at random and weighted. Then 0.5 ml blood was sampled in each chicken, the serum was separated in order to determine the NDV antibody level by HI.At the age of 35d, 10 chickens were picked at random from group one, three and four. Each chicken was intravenously injected with 1ml E.coli. After 1h, 2h, 3h, the blood was sampled separately, the number of the E.coli in blood were detected by the method of plate cultivation.At the age of 35d, 49d, from group one, three and four, 10 chickens with empty stomachs were picked out and weighted at random, separately. Then these chickens were killed through arterial carotids bloodletting, the weights and the indexes of spleen, chest gland and bursa were measured.The results showed that: compared with the control, the chickens in experimental groups were higher in weight, the index of immune organs, the level of NDV antibody and the growth inhibition of E. coli in vivo. Compared with the crude astragalus particles, super fine astragalus particles had advantages in gaining body weight, increasing average serum antibody titers against NDV and the indexes of bursa and chest gland, inhibiting the growth of E. coli in vivo.