2018
DOI: 10.1590/1678-4162-9486 View full text |Buy / Rent full text
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Abstract: RESUMO Esta pesquisa avaliou a TIP e a dinâmica de anticorpos (ACs) específicos em bezerros naturalmente expostos aos agentes causadores da doença respiratória bovina (DRB). Foram selecionados 19 bezerros Holandeses alimentados com colostro proveniente de doadoras vacinadas para DRB. Amostras de soro foram obtidas antes e após a ingestão do colostro (48h) para a soroneutralização (SN). Os valores médios (log2) detectados após colostragem foram de 11,5±1,6 (BVDV), 8,8±1,3 (BoHV-1), 5,5±1,6 (BRSV) e 8,4±1,5 (BPI… Show more

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“…Between 2013 and 2015, BVDV was confirmed for some cases of fetal infection by the detection of serum BVDV antibody in calves before colostrum intake. In addition, neonate calves were found to be BVDV positive by RT-PCR [25,26]. In this herd, our team investigated the evidence of specific antibodies against the BVDV p80 protein in heifers from 1 to 390 days of age (n = 585).…”
Section: Introductionmentioning
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“…Between 2013 and 2015, BVDV was confirmed for some cases of fetal infection by the detection of serum BVDV antibody in calves before colostrum intake. In addition, neonate calves were found to be BVDV positive by RT-PCR [25,26]. In this herd, our team investigated the evidence of specific antibodies against the BVDV p80 protein in heifers from 1 to 390 days of age (n = 585).…”
Section: Introductionmentioning
“…During pregnancy, the fetal-placental environment is regulated by Th2-type cytokines that neutralize Th1 responses, an important factor for immune defense against viral agents [5]. Temporary protection of newborns against respiratory viruses is enhanced by ingestion and absorption of colostrum containing immunoglobulins (Igs) responsible for the neutralization and elimination of the pathogen before it reaches the organs [8,20]. The maximum frequency of bovine respiratory disease (BRD) in heifers aged between 30 and 40 days is an indication of reduction of maternal antibodies and need for the establishment of early immunization protocols for prevention of BRD [14].…”
Section: Introductionmentioning