PSVI-14 Impact of <i>Bacillus Subtilis</i> and <i>Bacillus Licheniformis</i> on Weaning Weight and Subsequent Performance, Health and Immune Parameters When Challenged with PRRSV with and Without PRRS Vaccination

Abstract A study was conducted examining the impact of feeding BioPlus 2B to PRRSV naïve sows during gestation and lactation on litter performance post-weaning when challenged with in vaccinated unvaccinated pigs. total 108 were allotted by parity received a control diet (C) or (B2B) supplemented beginning minimum 31 d prior farrowing through weaning. Pig weight measured at birth 17 age. At weaning, subset 200 pigs from each treatment transported nursery randomly within dietary day 1 (-V) Ingelvac PRRS MLV vaccine (+V), establishing treatments C+V, C-V, B2B+V, B2B-V. On 21, all intramuscularly 1-18-2 virus. Growth rate feed intake monitored, serological immune measures recorded 28, 35 42, 42 gross lung lesions recorded. Pigs receiving B2B tended (P &amp;lt; 0.10) weigh more age 21 (Table 1). Prior challenge, there no differences among treatments. Post V x interaction B2B+V B2B-V having higher ADG FG .05) compared C-V. fed displayed improved lesion scores 0.05) regardless status. viremia, PCR qPCR decreased quickly consumed 0.05). Additionally, modulated specific T-cell interferon gamma production In conclusion, consuming fedB2B heavier weaning subjected challenge post-weaning, grew faster, efficient, had reduced lesions, likely due changes function.