Abstract:

A total of 210 one day-old broilers were randomly divided into 7groups with 30 each group.All the trial groups were fed 0.2 g Chinese herb complex with 1 kg weight. ⅠⅡ Ⅲ groups were fed 3days continuously(Ⅳ Ⅴ Ⅵ fed only 1day) before 5,3 and 0 day ND immunity respectively,and the control group(VII) was fed basic diet with no herbs.We detected ND antibody level of sera on 1 day before inoculation,14,21,28 and 40 day after inoculation.The results showed:Compared with control group,Chinese herb complex could improve the value of antibody, exceeding 20.2~1.6 titers average on peak.Ⅲgroup had significant difference in contrast to VII (P <0.05) and other groups had no significant difference (P>0.05).