Sarah Jahn1*
Gabriel Schmidt2
Lisa Bachmann2
Robert Kammerer3
Helen Louton4
Anne K. Schütz1†
Timo Homeier-Bachmann1*†- 1Institute of Epidemiology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany
- 2Animal Health Management, Faculty of Agriculture and Food Science, University of Applied Sciences Neubrandenburg, Neubrandenburg, Germany
- 3Institute of Immunology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany
- 4Animal Health and Animal Welfare, Faculty of Agricultural and Environmental Science, University of Rostock, Rostock, Germany
A Correction on
Individual behavior tracking of heifers by using object detection algorithm YOLOv4
By Jahn S, Schmidt G, Bachmann L, Kammerer R, Louton H, Schütz AK and Homeier-Bachmann T (2025). Front. Anim. Sci. 5:1499253. doi: 10.3389/fanim.2024.1499253
Author “Robert Kammerer” was omitted as an author in the published article. Author “Anne K. Schütz1” was incorrectly listed as last author. The correct author list reads:
“Sarah Jahn1*, Gabriel Schmidt2, Lisa Bachmann2, Robert Kammerer3, Helen Louton4, Anne K. Schütz1† and Timo Homeier-Bachmann1*†”
The citation and copyright have also been updated.
The Author Contributions statement has been corrected to read:
“SJ: Data curation, Formal analysis, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing. GS: Formal analysis, Validation, Writing – review & editing. LB: Project administration, Writing – review & editing. RK: Project administration, Resources, Writing – review & editing. HL: Supervision, Writing – review & editing. AS: Data curation, Formal analysis, Investigation, Methodology, Software, Supervision, Validation, Writing – review & editing. TH-B: Conceptualization, Methodology, Project administration, Resources, Supervision, Writing – review & editing”
Affiliation “Institute of Immunology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany” was omitted from the paper. This affiliation has now been added for author Robert Kammerer.
The location of the animal experiment was omitted, and the authors erroneously asserted that heifers were clinically unremarkable during the entire duration of the experiment.
A correction has been made to the section 2 Materials and methods, 2.1 Experimental setup, Paragraph 1:
“The video material used in this study was recorded during an animal experiment (authorized by the local authority in Mecklenburg-Western Pomerania (Landesamt für Landwirtschaft, Lebensmittelsicherheit und Fischerei (LALLF) Mecklenburg-Vorpommern), # FLI-7221.3-1-047/17) at the Friedrich-Loeffler-Institut on the isle of Riems – Greifswald (Germany). Heifers were infected with mycoplasma (Mycoplasma mycoides) (Hänske et al., 2023). Therefore, for biosafety reasons, the experiment was carried out in the biosafety level 2 animal facility at the FLI. A total of 20 heifers (Bos Taurus) of the Holstein Friesian breed were divided into four groups of five animals. No obvious clinical symptoms were recognizable in the video material used. Only three pens were equipped with cameras, therefore only three groups could be monitored by cameras 24 hours per day.”
There was a mistake in Figure 2 as published. New images with a clearer description over the functionality of the model were chosen. The corrected Figure 2 appears below.
Figure 2. Heifers were detected and located by coat pattern using the individual detector. (A) All heifers were detected while feeding, although the metal rod above the feeding fence covered parts of the heifers’ bodies. (B) All heifers were detected with a precision of 100%.
Funding from the German Ministry of Economic Cooperation and Development (Contract no. 81170269; Project No.13.1432.7-001.00) and the German Research Foundation (Project number 521734223) to RK was erroneously omitted.
In the Acknowledgements, the following sentence was omitted:
“We thank Jana Hänske, Martin Heller and Joerg Jores for their contribution to the animal experiment.”
The original version of this article has been updated.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Keywords: animal behavior, computer vision, YOLO(v4), heifer, individual detection, Holstein Friesian
Citation: Jahn S, Schmidt G, Bachmann L, Kammerer R, Louton H, Schütz AK and Homeier-Bachmann T (2025) Correction: Individual behavior tracking of heifers by using object detection algorithm YOLOv4. Front. Anim. Sci. 6:1596819. doi: 10.3389/fanim.2025.1596819
Received: 20 March 2025; Accepted: 04 July 2025;
Published: 25 July 2025.
Edited and Reviewed by:
Oleksiy Guzhva, Swedish University of Agricultural Sciences, SwedenCopyright © 2025 Jahn, Schmidt, Bachmann, Kammerer, Louton, Schütz and Homeier-Bachmann. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Sarah Jahn, U2FyYWguSmFobkBmbGkuZGU=; Timo Homeier-Bachmann, VGltby5Ib21laWVyQGZsaS5kZQ==
†These authors share senior authorship