鸡沙门氏菌弱毒苗与微生态制剂联合应用的效果

将鸡沙门氏菌弱毒苗分别与2种不同的微生态制剂配合对AA肉鸡实施免疫。结果表明，弱毒苗单独应用组、联合应用1组和2组的免疫保护效率分别为75％、90％和90％，均与攻毒对照组（40％）存在显著差异（P＜0．05）；攻毒20d后所有存活鸡细菌分离结果显示，上述3个试验组细菌分离率分别为53．5％、55％和5．5％，也均与攻毒对照组（75％）存在显著性差异（P＜0．05）。由此认为，该弱毒苗与上述微生态制剂联合应用的效果明显，具有较好的应用前景。

Effect of Attenuated Salmonella gallinarum Vaccine Combined with Microeco-logical Preparations

AA broiler chickens were admmistrated orally with attenuated Salmonella gallinarum and combined with two types of microecological agents respectively and then challenged with virulent S.gallinarum and S.pullorum at 15-day of age. The results showed that the protective efficacy of single vaccine using group, combined group 1 and combined group 2 was 75%, 90% and 90% respectively with significant difference to the control group. After 35-day of age the challenge strains were isolated from all of living chickens. The rates of isolation of three tested groups was 53.5%, 55%, 5.5% respectively with significant difference to the control group. It suggested that there was the protential for development a new bioproduct from the attenuated vaccine.