Serological monitoring of replacement gilts for porcine reproductive and respiratory syndrome
2001
Layug, M.A.B. | Tanquilut, N.C. | Lesing, R.T.
Six month-old replacement gilts from three commercial farms were subjected to serial serological monitoring for Porcine Reproductive and Respiratory Syndrome (PRRS). The study compared the S/P ratio of vaccinated and naturally exposed gilts. Results showed that the antibody titers of the vaccinated group were higher than those of unvaccinated groups. High S/P ratio of vaccinated replacement gilts was a good indication of the consistent exposure provided by the modified live vaccine (MLV) suggesting positive response to vaccination. Different age groups in two farms were profiled serologically. Results of the test revealed that in both farms, sucklings had an average S/P ratio higher than 0.4 which may be due to maternal antibodies. Moreover, active sero conversion was observed in the grower-finisher stage which was probably due to existence of subpopulations and persistently infected animals. These gilts may disseminate PRRS-virus (PRRSV) in the breeding herd thereby, destabilizing that unit
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