PRRSV阳性血清驯化对后备母猪繁殖性能的影响

摘要

[目的]对比分析猪繁殖与呼吸综合症病毒(PRRSV)阳性血清驯化和疫苗免疫两种方式对猪场后备母猪免疫抗体水平及繁殖性能的影响,为规模养殖场选择适宜免疫方式防控猪繁殖与呼吸综合症(PRRS)提供参考依据.[方法]以血清驯化和疫苗免疫两种方式分别免疫90日龄后备母猪,1个月后经前腔静脉窦采血检测抗体水平,同时测定后备母猪第一胎的受胎率、分娩率、胎产仔数、胎产活仔数、产弱仔率、产死胎率、产畸形及木乃伊率等繁殖性能指标.[结果]血清驯化与疫苗免疫后备母猪的血清抗体阳性率分别为100.00%和99.30%,但疫苗免疫后备母猪的抗体水平离散度相对较低,且较集中.血清驯化与疫苗免疫后备母猪第一胎的受胎率(96.79%vs 97.11%)、分娩率(88.55%vs 88.96%)、胎产仔数(11.26 vs 11.41)、胎产活仔数(10.3 vs 10.5)、产弱仔率(3.61%vs 3.32%)、产死胎率(2.96%vs 2.99%)、产畸形及木乃伊率(4.35%vs 4.13%)相近,二者差异不显著(P>0.05),但均优于对照后备母猪.[结论]在确定养猪场内只流行一种血清型PRRSV时,可采用血清驯化替代疫苗免疫防控PRRS,除了能有效提高后备母猪的繁殖性能外,还具有成本低廉、操作简单的特点.%[Objective]Effects of porcine reproductive and respiratory syndrome virus(PRRSV) positive serum accli-mation and vaccine immunization on immune antibody level and reproductive performance of gilts were analyzed, in order to provide reference for large-scale farms to select the proper immunity method to control porcine reproductive and respira-tory syndrome(PRRS). [Method]Gilts of 90 days were immunized with serum acclimation and vaccine immunization re-spectively. Blood samples were obtained from vena cava anterior to detect antibody level. Meanwhile, indexes of reproduc-tive performance were measured, including conception rate of the firstborn, delivery rate, litter size, number born alive of litter, weak piglet rate, stillbirth rate, deformity and mummy rate of gilts. [Result]Serum antibody positive rates of serum domestication group and vaccine immunization group reached 100.00% and 99.30% respectively. Antibody level dispersion of vaccine immunization group was low and its antibody level was concentrated. Conception rate of the firstborn(96.79% vs 97.11%), delivery rate(88.55% vs 88.96%), litter size(11.26 vs 11.41), number born alive of litter(10.3 vs 10.5), weak piglet rate(3.61% vs 3.32%), stillbirth rate(2.96% vs 2.99%), deformity and mummy rate(4.35% vs 4.13%) of gilts in serum domestication group and vaccine immunization group were close. The difference between the two groups was in-significant(P>0.05). The performances of the two groups were both better than that of control. [Conclusion]It is suitable way to immune pig with serum acclimation to prevent and control PRRSV when there is only a serotype PPRSV prevalent in pig farm. This vaccine method not only enhances the reproduction performance of gilts, but also costs less and operates easily.