2020
DOI: 10.22456/1679-9216.103174
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Abstract: Background: Newborn calves are born immunosuppressed, hypogammaglobulinemic, immunologically immature, and therefore more vulnerable to many infectious diseases. 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. The ingestion and absorption of colostral immunoglobulins enhance the immunity of the neonate. However, the presence of maternal antibodies might negatively affect the success … Show more

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“…Also, the conditions of the conduction of this study is a real farm routine not allowing the evaluation of the serological status of the herd prior to vaccination. However previous publication for our team developed in the same dairy herd shows an endemic status of this herd for BVDV, BoHV-1, BRSV, and BPI3 (SILVA et al, 2018;GoMES et al, 2019;SILVA et al, 2020). Another evidence of the natural circulation of respiratory viruses is the profile presented in this study by the control group.…”
Section: Resultsmentioning
confidence: 76%
“…Also, the conditions of the conduction of this study is a real farm routine not allowing the evaluation of the serological status of the herd prior to vaccination. However previous publication for our team developed in the same dairy herd shows an endemic status of this herd for BVDV, BoHV-1, BRSV, and BPI3 (SILVA et al, 2018;GoMES et al, 2019;SILVA et al, 2020). Another evidence of the natural circulation of respiratory viruses is the profile presented in this study by the control group.…”
Section: Resultsmentioning
confidence: 76%