<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec id="j_jvetres-2022-0001_s_005">
<h3>Introduction</h3>
<p>Johne’s disease, caused by infection with <italic>Mycobacterium avium</italic> subsp. <italic>paratuberculosis</italic> (MAP), causes economic losses in dairy herds due to reduced milk production and premature culling. A test-and-cull strategy coupled with changes in calf rearing management preventing new infections has been introduced into infected herds to control MAP prevalence. This study appraised the effectiveness of these practice changes.</p>
</sec>
<sec id="j_jvetres-2022-0001_s_006">
<h3>Material and Methods</h3>
<p>In 19 large dairy herds (of a median 470 milk-producing cows), implementing MAP control measures for 3–7 years, a serum ELISA was used to detect infected cows in their dry-off period. The number of ELISA-positive animals per year (EPAY) was calculated and statistical analysis was used to test whether the EPAY total decreased during the control period and to analyse the EPAY in relationship to the duration of the control programme.</p></sec>
<sec id="j_jvetres-2022-0001_s_007">
<h3>Results</h3>
<p>Statistical support was found for a decrease of EPAY over time (P &lt; 0.01, odds ratio 0.756) and in 14 herds a significant fall in the percentages of EPAY during the test period (P ≤ 0.05) was noted.</p></sec>
<sec id="j_jvetres-2022-0001_s_008">
<h3>Conclusion</h3>
<p>Our results demonstrated the effectiveness of the control measures in place to reduce MAP infection in herds with initial EPAY ≥3.36%. The missing decreasing trend in the remaining five herds with low average initial EPAY suggested the need for additional measures to reduce the number of infected animals in these herds.</p>
</sec>
</abstract>

Introduction
Johne’s disease, caused by infection with Mycobacterium avium subsp. paratuberculosis (MAP), causes economic losses in dairy herds due to reduced milk production and premature culling. A test-and-cull strategy coupled with changes in calf rearing management preventing new infections has been introduced into infected herds to control MAP prevalence. This study appraised the effectiveness of these practice changes.


Material and Methods
In 19 large dairy herds (of a median 470 milk-producing cows), implementing MAP control measures for 3–7 years, a serum ELISA was used to detect infected cows in their dry-off period. The number of ELISA-positive animals per year (EPAY) was calculated and statistical analysis was used to test whether the EPAY total decreased during the control period and to analyse the EPAY in relationship to the duration of the control programme.

Results
Statistical support was found for a decrease of EPAY over time (P < 0.01, odds ratio 0.756) and in 14 herds a significant fall in the percentages of EPAY during the test period (P ≤ 0.05) was noted.

Conclusion
Our results demonstrated the effectiveness of the control measures in place to reduce MAP infection in herds with initial EPAY ≥3.36%. The missing decreasing trend in the remaining five herds with low average initial EPAY suggested the need for additional measures to reduce the number of infected animals in these herds.

Effective control of Johne’s disease in large Czech dairy herds

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Effective control of Johne\u2019s disease in large Czech dairy herds"}

Introduction
Johne’s disease, caused by infection with Mycobacterium avium subsp. paratuberculosis (MAP), causes economic losses in dairy herds due to reduced...

Effective control of Johne’s disease in large Czech dairy herds

Publié en ligne: 25 mars 2022

Pages: 61 - 67

Reçu: 24 août 2021

Accepté: 20 déc. 2021

DOI: https://doi.org/10.2478/jvetres-2022-0001

Mots clés
dairy cattle, Johne’s disease, serum ELISA, MAP control

© 2022 V. Fichtelová et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Effective control of Johne’s disease in large Czech dairy herds

Publié en ligne: 25 mars 2022

Pages: 61 - 67

Reçu: 24 août 2021

Accepté: 20 déc. 2021

DOI: https://doi.org/10.2478/jvetres-2022-0001

Mots clésdairy cattle, Johne’s disease, serum ELISA, MAP control

© 2022 V. Fichtelová et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
dairy cattle, Johne’s disease, serum ELISA, MAP control