[Objective] This study was conducted to investigate the effects of Echi-nacea purpurea polysaccharides （EPS） on proliferation of rat intestinal epithelial cel IEC-6. [Method] The proliferation rate of IEC-6 cel s cultured in EPS at different concentrations and for different time was measured by MTT assay and analyzed by statistic methods. [Result] The proliferation rate of IEC-6 cel s cultured in EPS at al the concentrations and for different time was improved by different extents in com-parison with the control. In detail, 50 and 200 μg/ml EPS greatly improved the IEC-6 cel proliferation after 24 h of culture; then, the cel proliferation rate in the two treatments increased from 24 to 48 h, and declined from 48 to 72 h. The cel pro-liferation was also significantly improved by culturing in 100 μg/ml EPS for 72 h and in 500 μg/ml EPS for 48 h. After 48 h of culture, the proliferation rate of IEC-6 cel increased in a EPS dose-dependent manner. [Conclusion] EPS can promote IEC-6 cel proliferation, and thus improve the intestinal mucosal absorption and immune function of rat.
Objective] The passing rates of porcine reproductive and respiratory syn-drome virus （PRRSV） vaccine and classical swine fever virus （CSFV） vaccine were investigated in this paper. The PRRSV vaccine was injected in 14-d-old piglets and the CSFV vaccine was injected in 25-d-old piglets. [Method] The antibody expres-sion amounts were detected with the PRRSV antibody ELlSA detection kit and the CSFV antibody ELlSA detection kit. [Result] The antibody positive rates were 6.7%, 26.7%, 85% and 100% 3, 7, 14 and 30 d after the vaccination of PRRSV vaccine. While for the CSFV vaccine, 13%, 40%, 58.3% and 83.3% of the immune individu-als were antibody positive 3, 7, 14 and 30 d after the vaccination. [Conclusion] The PRRSV vaccine showed the lowest antibody tilter 3 d after the inoculation, but had a great vaccination effect 30 d after the inoculation. The piglets were not immune enough against viral invasion 3 d after the inoculation of CSFV vaccine. Although the antibody positive rate of PRRSV and CSFV vaccines al reached the required level by the Ministry of Agriculture （70%） 30 d after the inoculation, the vaccination of CSFV vaccine could not achieve the ideal effect of 100%.
