Data för: A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds Data for: A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds 2024-56-1 SLU.klinvet.2024.4.4.IÄ-6 https://doi.org/10.5878/c45h-ke16 Swedish National Data Service Svensk nationell datatjänst Landing page Data för: A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds Data for: A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds 2024-56-1 SLU.klinvet.2024.4.4.IÄ-6 https://doi.org/10.5878/c45h-ke16 10.3168/jds.2024-25304 Hurri, Emma Hurri, Emma Tråvén, Madeleine Tråvén, Madeleine 2018/00943 2018/00943 Swedish National Data Service Svensk nationell datatjänst Landing page Mycoplasma bovis Mycoplasma bovis Biosecurity Bioskydd heifers mycoplasmoses Plants and animals Växter och djur In this study the aims were: (1) to monitor the changes in M. bovis antibody status in BTM and milk from PP cows in Swedish dairy herds over time, and (2) to investigate potential risk factors and herd health variables associated with M. bovis antibodies in primiparous cows. Study population Five regions in the south of Sweden with previously knowned cases of M. bovis were selected for the study. Dairy herds from these regions with an average of more than 70 cows (both lactating and dry) on a yearly basis and affiliated to the Dairy Herd Improvement (DHI) database (Växa Sverige) were invited to participate in the study. 139 herds accepted and ten herds joined later due to contact with infected herds or diagnosing Mycoplasma bovis at the herd. In total, 143 herds were used in the statistical analysis, six herds had no samples from primiparous cows and were dropped. Sampling Herds were sampled four times with approximately six-month intervals, in (1) September 2019, (2) February 2020, (3) November 2020 and (4) May 2021, with a two-month long sampling window each time. For each herd, on each sampling occasion, milk samples were collected from the three youngest home-bred PP cows and BTM. Data Herd-level data on health and production variables were retrieved from the Dairy Herd Improvement database, Växa Sverige. The data were aggregated in four 12-month periods calculated backwards from the start of each sampling period, (1) 2019-09-01, (2) 2020-02-01, (3) 2020-11-01 and (4) 2021-05-01. Data regarding mortality, culling rates, reproductive performance, and veterinary-reported clinical diseases were calculated as cases per 100 animals at risk. Breed was classified into four categories on herd level, the main breed constituting more than 80% of the cows. Herd-level data in 12-month periods regarding herd size (i.e., number of female animals >24 months old), number of introduced cattle, median age of introduced cattle, and number of herds the introduced cattle were received from (inherds) were collected from the National Cattle Database (Swedish Board of Agriculture 2022). Data on herd size (number of milking cows) in fifteen herds not affiliated with the DHI were retrieved from a questionnaire answered by these farmers during autumn 2020. Provtagning och datauttag om produktion och hälsa för 143 mjölkgårdar i södra Sverige. Prover insamlades under två år och data har tagits ut för 3 år. Proverna är tankmjölksprov och mjölkprov från förstakalvare och de har analyserats för Mycoplasma bovis antikroppar. Provtagningsresultat och variabler om hälsa, produktion, besättningsstorlek, ras samt inköp av djur på gårdsnivå inklusive förklaringar till dessa variabler. För en mer fullständig beskrivning hänvisas till den engelska beskrivningen. 2018-09-01 2022-02-28 2018-09-01 2022-02-28 2019-09-01 2021-08-31 2020-10-01 2020-12-31 Sweden Sverige GroupGroup GruppGrupp IndividualIndividual IndividIndivid Study population Five regions in the south of Sweden with previously knowned cases of M. bovis were selected for the study. Dairy herds from these regions with an average of more than 70 cows (both lactating and dry) on a yearly basis and affiliated to the Dairy Herd Improvement (DHI) database (Växa Sverige) were invited to participate in the study. 139 herds accepted and ten herds joined later due to contact with infected herds or diagnosing Mycoplasma bovis at the herd. In total, 143 herds were used in the statistical analysis, six herds had no samples from primiparous cows and were dropped. Mjölkbesättningar med mer än 70 kor i södra Sverige och anslutna till kokontrollen blev inbjudna att delta i denna studie. 143 gårdar tackade ja. For more information see description in English. Numeric Text LongitudinalLongitudinal LongitudinellLongitudinell Invitation letter to participate in the studyInvitation letter to participate in the study Inbjudan att delta i studien via brevInbjudan att delta i studien via brev Non-probability: AvailabilityNon-probability: Availability Icke-sannolikhetsurval: tillgänglighetsurvalIcke-sannolikhetsurval: tillgänglighetsurval Data withdrawal from the National Cattle database (CDB)Data withdrawal from the National Cattle database (CDB) Utdrag från CDB, Centrala djurdatabasenUtdrag från CDB, Centrala djurdatabasen Registry extract and/or access to biobank sampleRegistry extract and/or access to biobank sample Registerutdrag och/eller tillgång till prov i biobankRegisterutdrag och/eller tillgång till prov i biobank Data withdrawal from the Dairy Herd Improvement database, aggregated at herd-level. Växa Sverige.Data withdrawal from the Dairy Herd Improvement database, aggregated at herd-level. Växa Sverige. Uttag av data från kokontrollen, aggregerat på gårdsnivå. Växa Sverige.Uttag av data från kokontrollen, aggregerat på gårdsnivå. Växa Sverige. Registry extract and/or access to biobank sampleRegistry extract and/or access to biobank sample Registerutdrag och/eller tillgång till prov i biobankRegisterutdrag och/eller tillgång till prov i biobank Withdrawal of bulk tank milk and individual milk samples from the milk quality laboratory Eurofins in Jönköping. The milk samples were sent to KV-lab at SLU for further analysis. In addition som farm owners collected milk from primiparous cows and sent by postal service to KV-lab at SLU.Withdrawal of bulk tank milk and individual milk samples from the milk quality laboratory Eurofins in Jönköping. The milk samples were sent to KV-lab at SLU for further analysis. In addition som farm owners collected milk from primiparous cows and sent by postal service to KV-lab at SLU. Uttag av tankmjölk och individuella mjölkprover via mjölkkvalitets laboratoriet Eurofins i Jönköping. Mjölkproverna skickades till KV-labb på SLU för vidare analys. I tillägg tog djurägarna mjölkprover från förstakalvare och skickade med post till KV-labb på SLU.Uttag av tankmjölk och individuella mjölkprover via mjölkkvalitets laboratoriet Eurofins i Jönköping. Mjölkproverna skickades till KV-labb på SLU för vidare analys. I tillägg tog djurägarna mjölkprover från förstakalvare och skickade med post till KV-labb på SLU. Biological testsBiological tests Biologiska provtagningarBiologiska provtagningar Questionnaire sent to participating herdsQuestionnaire sent to participating herds Enkät som skickats ut till deltagande gårdarEnkät som skickats ut till deltagande gårdar Self-administered questionnaireSelf-administered questionnaire Självadministrerat frågeformulärSjälvadministrerat frågeformulär Access to data through SND. Access to data is restricted. Åtkomst till data via SND. Tillgång till data är begränsad. restrictedAccess Hurri, E., Alvåsen, K., Widgren, S., Ohlson, A., Aspán, A., Pedersen, K. and Tråvén, M. (2025). A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds. Journal of Dairy Science, 108 (1), 845-855. https://doi.org/10.3168/jds.2024-25304 Hurri, E., Alvåsen, K., Widgren, S., Ohlson, A., Aspán, A., Pedersen, K. and Tråvén, M. (2025). A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds. Journal of Dairy Science, 108 (1), 845-855. https://doi.org/10.3168/jds.2024-25304 10.3168/jds.2024-25304 2025