繁殖障碍性疾病流行猪场免疫效果的试验研究

Upgrading of Electrohydraulic Control Systems for Aged Power Generating Sets

选择表现猪繁殖障碍性疾病的某规模化猪场,对20头初产母猪、20头经产母猪、12头种公猪、20头新生仔猪进行猪瘟、猪伪狂犬病、猪生殖与呼吸综合征、猪细小病毒病及猪乙型脑炎免疫效果试验及血清学检测。结果表明,该场存在伪狂犬病和猪生殖与呼吸综合征混合感染,并且可能主要由于伪狂犬病和猪生殖与呼吸综合征的感染造成猪瘟免疫失败。因此要控制猪繁殖障碍性疾病,必须注重综合防制,优化免疫程序,把握引种关,加强生物安全等关键措施。

The problems with two types of hydraulically-operate d protective systems of aged power generating sets are presented,and how to choose from the four commonly used upgrading schemes t o overcome these problems is detailed to improve the automation, reliability an d adaptability of aged power generating sets.