Theileria orientalis Ikeda infection does not negatively impact growth performance or breeding soundness exam results in young beef bulls at bull test stations

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dc.contributor.authorGuynn, Sierra R.en
dc.contributor.authorGreiner, Scott P.en
dc.contributor.authorCurrin, John F.en
dc.contributor.authorTodd, S. Michelleen
dc.contributor.authorAssenga, Alphonceen
dc.contributor.authorHungerford, Laura L.en
dc.contributor.authorLahmers, Kevin K.en
dc.date.accessioned2024-12-16T14:09:22Zen
dc.date.available2024-12-16T14:09:22Zen
dc.date.issued2024-07-18en
dc.description.abstractIntroduction: Theileria orientalis Ikeda genotype is an emerging cattle disease in the US. Since 2017, when T. orientalis Ikeda was discovered in beef cattle in two counties in Virginia, cattle infections have risen to include ~67% of Virginia counties and 14 states. Consistent with New Zealand studies, many infected herds in Virginia were >90% positive upon initial testing without overt evidence of infection. Central bull tests present a unique opportunity to study the effects of T. orientalis Ikeda infections, as bulls from multiple source herds are consolidated. The objective of this study was to determine if infection with T. orientalis Ikeda affected the average daily gain (ADG), adjusted yearling weight (AYW) and breeding soundness of bulls at two test stations in Virginia over a period of years. Materials and methods: The bulls were fed and housed similarly to compare their growth performance and breeding soundness. For T. orientalis Ikeda testing, DNA was extracted from whole blood for quantitative polymerase chain reaction. Results: The number of bulls infected with T. orientalis Ikeda at initial delivery to the stations increased significantly over the years studied. Multivariable linear regression models, using Angus bulls from Virginia test stations, indicated no significant effect on ADG or AYW in bulls that became test positive during the test or were positive for the duration, compared to Angus bulls that were negative for the duration. At LOC A, the odds of passing a breeding soundness exam (BSE) were not significantly different for bulls that turned positive during the test or were positive for the duration, compared to bulls that were negative for the duration of the test. At LOC B, bulls that became positive during the test were 2.4 times more likely (95% CI: 1.165–4.995, p = 0.016) to pass their BSE compared to bulls that remained negative throughout the test. Discussion: We do not suppose that an obscured infection of T. orientalis Ikeda is protective for bulls to pass a BSE. However, this study demonstrates an obscured infection of T. orientalis Ikeda does not negatively affect weight gain or achievement of a satisfactory BSE rating at the central bull test stations in Virginia.en
dc.description.versionPublished versionen
dc.format.extent9 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN 1432228 (Article number)en
dc.identifier.doihttps://doi.org/10.3389/fvets.2024.1432228en
dc.identifier.eissn2297-1769en
dc.identifier.issn2297-1769en
dc.identifier.orcidGreiner, Scott [0000-0002-0599-9891]en
dc.identifier.orcidLahmers, Kevin [0000-0002-5290-3426]en
dc.identifier.otherPMC11291446en
dc.identifier.pmid39091393en
dc.identifier.urihttps://hdl.handle.net/10919/123805en
dc.identifier.volume11en
dc.language.isoenen
dc.publisherFrontiersen
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/39091393en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectbeef cattleen
dc.subjectTheileria orientalis (Ikeda)en
dc.subjectaverage daily gain (ADG)en
dc.subjectbreeding soundness evaluation (BSE)en
dc.subjectbullen
dc.title<i>Theileria orientalis</i> Ikeda infection does not negatively impact growth performance or breeding soundness exam results in young beef bulls at bull test stationsen
dc.title.serialFrontiers in Veterinary Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
dcterms.dateAccepted2024-07-03en
pubs.organisational-groupVirginia Techen
pubs.organisational-groupVirginia Tech/Agriculture & Life Sciencesen
pubs.organisational-groupVirginia Tech/Agriculture & Life Sciences/School of Animal Sciencesen
pubs.organisational-groupVirginia Tech/Veterinary Medicineen
pubs.organisational-groupVirginia Tech/Veterinary Medicine/Biomedical Sciences and Pathobiologyen
pubs.organisational-groupVirginia Tech/Faculty of Health Sciencesen
pubs.organisational-groupVirginia Tech/All T&R Facultyen
pubs.organisational-groupVirginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen

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