Changes in PRRSV pathogen detection,antibody levels,and reproductive performance indicators caused by PRRS in sows
The aim of this experiment was to compare the changes of porcine reproductive and respiratory syndrome virus(PRRSV)pathogen detection,serum antibody levels and reproductive performance indexes of sows before and after introduction of porcine reproductive and respiratory syndrome(PRRS),and to explore the improvement effects of drugs and inactivated PRRSV vaccine on these indexes.The results showed that the positive rate of PRRSV was 0 before the onset,and 30%,40%,12%,and 10%after the onset,respectively.No Ct values were detected before onset,the median Ct values were 26.45,30.82,32.92,and 33.85 after the onset,respectively.The positive rate of serum PRRSV antibody was 78.65%before onset,97.14%,95.89%,and 91.43%after onset,respectively.The mean value of S/P was 1.11 before onset,and 1.69,1.88,and 1.43 after onset,respectively.The mismatched rate of sows was 1.92%before introduction and 2.50%～13.77%after introduction.The sow delivery rate was 94.72%before introduction and 84.41%～94.05%after introduction.The ineffective litter rate was 7.37%before introduction and 5.26%～10.43%after introduction.The mortality rate of sows was 0.52%before introduction and 0.38%～0.90%after introduction.The mortality rate of piglets was 3.14%before introduction and 2.02%～4.68%after introduction.The results indicated that after the onset of PRRS in sows,the positive rate of PRRSV nucleic acid and antibody levels increased,the median Ct value increased month by month,the mismatch rate,ineffective litter rate,sow and piglet mortality increased,and the delivery rate decreased.The above indexes lasted for 2～5 months.The drug and PRRSV inactivated vaccine can improve the mortality of sows and piglets to some extent,but can not improve the persistent infection and reproductive performance with PRRSV.
万方数据
维普
