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Data for: A longitudinal study of the dynamics of Mycoplasma bovis antibody status in primiparous cows and bulk tank milk in Swedish dairy herds

https://doi.org/10.5878/c45h-ke16
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.
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Documentation files

Citation and access

Data access level:

Creator/​Principal investigator(s):

Research principal:

Principal's reference number:

  • SLU.klinvet.2024.4.4.IÄ-6

Data contains personal data:

Yes

Type of personal data:

Herd-level data pertaining to individual farmers whose identities are pseudonymised

Code key exists:

Yes

Data contain other protected information:

Yes

Type of protected information:

Data from the Dairy herd improvement database with detailed information about health and production at participating dairy herds

Citation:

Language:

Method and outcome

Unit of analysis:

Population:

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.

Time method:

Study design:

  • Observational study

Sampling procedure:

Description of sampling:

Invitation letter to participate in the study

Time period(s) investigated:

Variables:

32

Number of individuals/​objects:

143

Data format/​data structure:

Data collections 4 collections

Data collection Registry extract and/or access to biobank sample

Mode of collection:

Registry extract and/or access to biobank sample

Description of the mode of collection:

Data withdrawal from the National Cattle database (CDB)

Time period(s) for data collection:

2018-09-01 - 2022-02-28

Data collector:

Source of the data:

  • Registers/Records/Accounts

Data collection Registry extract and/or access to biobank sample

Mode of collection:

Registry extract and/or access to biobank sample

Description of the mode of collection:

Data withdrawal from the Dairy Herd Improvement database, aggregated at herd-level. Växa Sverige.

Time period(s) for data collection:

2018-09-01 - 2022-02-28

Data collector:

  • Växa Sverige

Sample size:

149

Non response size:

6

Source of the data:

  • Registers/Records/Accounts

Cause of non response

Reason:

Respondent unable to participate

Size:

Data collection Biological tests

Mode of collection:

Biological tests

Description of the mode of collection:

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.

Time period(s) for data collection:

2019-09-01 - 2021-08-31

Data collector:

Data collection Self-administered questionnaire

Mode of collection:

Self-administered questionnaire

Description of the mode of collection:

Questionnaire sent to participating herds

Time period(s) for data collection:

2020-10-01 - 2020-12-31

Data collector:

Source of the data:

  • Research data: Unpublished
  • Research data

Geographic coverage

Geographic location:

Geographic description:

Southern Sweden

Lowest geographic unit:

Municipality

Highest geographic unit:

County (NUTS 3)

Administrative information

Responsible department/​unit:

Department of Clinical Sciences

Other research principals:

Ethical Review

Reviewer:

  • Uppsala Ethical Review Board

Registration number:

5.8.18-02650/2019

Funding

Funding agency:

Award number:

2018/00943

Award title:

Mycoplasma bovis - increased risk of antimicrobial resistance in Swedish cattle. Herd-level diagnostics and knowledge on epidemiology to prevent transmission

Topic and keywords

CESSDA topic classification:

Swedish Standard Classification of Research Subjects 2025:

Keywords:

Publications

Citation:

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

Contact

Emma Hurriemma.hurri@slu.se

Metadata

Version 1
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