Jenny Stracke

Scopus Publications

Measuring sleep in farm animals: Achievements and challenges
Sarah Maria Möseler, Jenny Stracke
Applied Animal Behaviour Science, 2026
Effects of automated short-term incomplete milking during peak to mid lactation on udder firmness, heart-rate variability, and behavior recordings in dairy cows
Robin Joest, Jenny Stracke, Ute Müller
Applied Animal Behaviour Science, 2025
Use of an elevated platform with perforated surface and manure belt by fast-growing broilers on commercial farms
F. May, B. Spindler, J. Müsse, K. Skiba, N. Kemper, et al.
Poultry Science, 2024
Dietary tryptophan supplementation and affective state in pigs
Proceedings of the 51st Congress of the International Society for Applied Ethology Understanding Animal Behaviour, 2023
Sexual Dimorphism in Bone Quality and Performance of Conventional Broilers at Different Growth Phases
Johanna Müsse, Helen Louton, Birgit Spindler, Jenny Stracke
Agriculture Switzerland, 2022
The objective of this study was to analyze sexual dimorphism with regard to the bone quality of Ross 308 broilers. The relationship between carcass traits, performance and bone quality was analyzed. The effect of sex and age at slaughter was examined in four replicates, always on day 31 and day 38. The weight, length, minimum diameter and breaking strength of the tibiotarsi were measured to determine the bone quality. Female tibiotarsi were shorter, lighter and had a lower minimum diameter and breaking strength compared to male ones. The tibiotarsi of older broilers were found to show higher values in the three-point bending test. The effects on broiler performance were determined by measuring the live body weight, carcass and cut weights. The results demonstrate significant effects of the age at slaughter and the sex (p < 0.001) on all measured parameters, with males always reaching higher values compared to females. A strong correlation of performance and bone parameters could be observed between live weight and weight of the tibiotarsi on both days of data collection. Therefore, it could be beneficial to raise female and male broilers separately. However, in order to make specific recommendations for practice, further knowledge is necessary.
Keypoint Detection for Injury Identification during Turkey Husbandry Using Neural Networks
Nina Volkmann, Claudius Zelenka, Archana Malavalli Devaraju, Johannes Brünger, Jenny Stracke, et al.
Sensors, 2022
Injurious pecking against conspecifics is a serious problem in turkey husbandry. Bloody injuries act as a trigger mechanism to induce further pecking, and timely detection and intervention can prevent massive animal welfare impairments and costly losses. Thus, the overarching aim is to develop a camera-based system to monitor the flock and detect injuries using neural networks. In a preliminary study, images of turkeys were annotated by labelling potential injuries. These were used to train a network for injury detection. Here, we applied a keypoint detection model to provide more information on animal position and indicate injury location. Therefore, seven turkey keypoints were defined, and 244 images (showing 7660 birds) were manually annotated. Two state-of-the-art approaches for pose estimation were adjusted, and their results were compared. Subsequently, a better keypoint detection model (HRNet-W48) was combined with the segmentation model for injury detection. For example, individual injuries were classified using “near tail” or “near head” labels. Summarizing, the keypoint detection showed good results and could clearly differentiate between individual animals even in crowded situations.
DEEP LEARNING-BASED TRACKING OF MULTIPLE OBJECTS IN THE CONTEXT OF FARM ANIMAL ETHOLOGY
R. Ali, M. Dorozynski, J. Stracke, M. Mehltretter
International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences ISPRS Archives, 2022
Automatic detection and tracking of individual animals is important to enhance their welfare and to improve our understanding of their behaviour. Due to methodological difficulties, especially in the context of poultry tracking, it is a challenging task to automatically recognise and track individual animals. Those difficulties can be, for example, the similarity of animals of the same species which makes distinguishing between them harder, or sudden changes in their body shape which may happen due to putting on or spreading out the wings in a very short period of time. In this paper, an automatic poultry tracking algorithm is proposed. This algorithm is based on the well-known tracktor approach and tackles multi-object tracking by exploiting the regression head of the Faster R-CNN model to perform temporal realignment of object bounding boxes. Additionally, we use a multi-scale re-identification model to improve the re-association of the detected animals. For evaluating the performance of the proposed method in this study, a novel dataset consisting of seven image sequences that show chicks in an average pen farm in different stages of growth is used.
Footpad Monitoring: Reliability of an Automated System to Assess Footpad Dermatitis in Turkeys (Meleagris gallopavo) During Slaughter
Jenny Stracke, Robby Andersson, Nina Volkmann, Birgit Spindler, Jan Schulte-Landwehr, et al.
Frontiers in Veterinary Science, 2022
Footpad dermatitis (FPD) is an indicator of animal welfare in turkeys, giving evidence of the animals' physical integrity and providing information on husbandry management. Automated systems for assessing FPD at slaughter can present a useful tool for objective data collection. However, using automated systems requires that they reliably assess the incidence. In this study, the feet of turkeys were scored for FPD by both an automated camera system and a human observer, using a five-scale score. The observer reliability between both was calculated (Krippendorff's alpha). The results were not acceptable, with an agreement coefficient of 0.44 in the initial situation. Therefore, pictures of 3,000 feet scored by the automated system were evaluated systematically to detect deficiencies. The reference area (metatarsal footpad) was not detected correctly in 55.0% of the feet, and false detections of the alteration on the footpad (FPD) were found in 32.9% of the feet. In 41.3% of the feet, the foot was not presented straight to the camera. According to these results, the algorithm of the automated system was modified, aiming to improve color detection and the distinction of the metatarsal footpad from the background. Pictures of the feet, now scored by the modified algorithm, were evaluated again. Observer reliability could be improved (Krippendorff's alpha = 0.61). However, detection of the metatarsal footpad (50.9% incorrect detections) and alterations (27.0% incorrect detections) remained a problem. We found that the performance of the camera system was affected by the angle at which the foot was presented to the camera (skew/straight; p &lt; 0.05). Furthermore, the laterality of the foot (left/right) was found to have a significant effect (p &lt; 0.001). We propose that the latter depends on the slaughter process. This study also highlights a high variability in observer reliability of human observers. Depending on the respective target parameter, the reliability coefficient (Krippendorff's alpha) ranged from 0.21 to 0.82. This stresses the importance of finding an objective alternative. Therefore, it was concluded that the automated detection system could be appropriate to reliably assess FPD at the slaughterhouse. However, there is still room to improve the existing method, especially when using FPD as a welfare indicator.
Structuring Broiler Barns: How a Perforated Flooring System Affects Animal Behavior
Franziska May, Jenny Stracke, Sophia Heitmann, Carolin Adler, Alica Krasny, et al.
Animals, 2022
Broiler chickens in Europe are usually raised in a barren environment. Elevated perforated platforms address this problem and can positively influence animal health and welfare. To evaluate the effect of an elevated perforated floor on the behavior of broiler chickens, one of two barns was equipped with a perforated flooring system under the food and water supply. The second barn was used as a control. In total, three fattening periods were observed, with 500 broiler chickens (Ross 308 breed) kept in each barn. To compare the behavior of the birds in these groups, cameras were installed in the two barns. The videos were analyzed by counting the number of birds and observing focal animals while recording their behavior. More animals were observed on the perforated floor than in the littered control area (p < 0.001), but focal animals spent less time on the perforated floor compared to the observed littered area in the control barn (p < 0.05). There were no differences in the length of the recorded behaviors between the treatments. These findings suggest that, in general, the elevated perforated floor is attractive for the animals. However, it does not promote one of the recorded behavior patterns. Our results show that an elevated perforated floor could be an option for structuring broiler barns.
Automatic Scoring System for Monitoring Foot Pad Dermatitis in Broilers
Helen Louton, Shana Bergmann, Andre Piller, Michael Erhard, Jenny Stracke, et al.
Agriculture Switzerland, 2022
The assessment of foot pad dermatitis at slaughter is a suitable method to assess and monitor the welfare of broilers. The goals of this study were to define and validate a camera-based score that could identify macroscopic lesions of the foot pads, to identify errors, and to assess possible external factors that could influence the assessment. In the first phase 200 feet of broilers and in the second phase 500 feet were collected at slaughter, assessed visually, hung back into the evisceration line, and assessed by an automatic system. The camera score cut-off values were defined in the first (=calibration) phase. In the second (=validation) phase, the performance of diagnosis for these cut-off values was evaluated, and possible errors in the assessment of reference surface area and foot pad lesions were analyzed. The results showed that, in particular, Macro Scores 0, 2, and 3 could be identified with sufficiently high sensitivity. For Macro Score 1, the sensitivity of diagnosis was not sufficiently high in the two evaluated software versions. The current automatic assessment systems at slaughter could be adjusted to the cut-off values in order to classify foot pad dermatitis lesions. Furthermore, software updates can enhance the performance measures and lower the probability of errors.
Where does it hurt? Injury identification in turkeys using keypoint detection
Precision Livestock Farming 2022 Papers Presented at the 10th European Conference on Precision Livestock Farming Ecplf 2022, 2022
A Data-Centric Approach for Improving Ambiguous Labels with Combined Semi-supervised Classification and Clustering
Lars Schmarje, Monty Santarossa, Simon-Martin Schröder, Claudius Zelenka, Rainer Kiko, et al.
Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics, 2022
Is one annotation enough?
Advances in Neural Information Processing Systems, 2022
Boys (toms) don't try. Behaviour of turkeys in a Novel Object test – Influence of age and sex
K. Kulke, N. Kemper, J. Stracke
Applied Animal Behaviour Science, 2021
Use of space, active and resting behaviour in fattening rabbits (Oryctolagus cuniculus) housed in a combi park system: A case study
S Kimm, SL Rauterberg, J Bill, J Stracke, N Kemper, et al.
Animal Welfare, 2021
Learn to train: Improving training data for a neural network to detect pecking injuries in Turkeys
Nina Volkmann, Johannes Brünger, Jenny Stracke, Claudius Zelenka, Reinhard Koch, et al.
Animals, 2021
Learning by teaching: Exam-oriented preparation of lecture material with Moodle (concept for an elective course)
Kleintierpraxis, 2021
On-farm detection of claw lesions in dairy cows based on acoustic analyses and machine learning
N. Volkmann, B. Kulig, S. Hoppe, J. Stracke, O. Hensel, et al.
Journal of Dairy Science, 2021
Walking on Tiptoes: Digital Pads Deserve Increased Attention When Scoring Footpad Dermatitis as an Animal Welfare Indicator in Turkeys
Jenny Stracke, Nina Volkmann, Franziska May, Stefanie Döhring, Nicole Kemper, et al.
Frontiers in Veterinary Science, 2021
Determination of static space requirements for finishing bulls based on image analysis
N Volkmann, J Stracke, SL Rauterberg, B Spindler, N Kemper
Animal Welfare, 2021
Scratch the surface: Histopathology of foot-pad dermatitis in turkeys (Meleagris gallopavo)
J Stracke, D Klotz, P Wohlsein, S Döhring, N Volkmann, et al.
Animal Welfare, 2020
Effects of a slatted floor on bacteria and physical parameters in litter in broiler houses
Sophia Heitmann, Jenny Stracke, Carolin Adler, Marwa F.E. Ahmed, Jochen Schulz, et al.
Veterinary and Animal Science, 2020
Histologically validated scoring system for the assessment of hock burn in broilers
H. Louton, A. Piller, S. Bergmann, M. Erhard, J. Stracke, et al.
Avian Pathology, 2020
Validation of histological and visual scoring systems for foot-pad dermatitis in broiler chickens
A Piller, S Bergmann, A Schwarzer, M Erhard, J Stracke, et al.
Animal Welfare, 2020
Microbiological air quality in free-farrowing housing systems for sows
E. Lühken, T. Nicolaisen, J. Stracke, J. Schulz, N. Kemper
Veterinary and Animal Science, 2019
Effects of enriched charcoal as permanent 0.2% feed-additive in standard and low-protein diets of male fattening Turkeys: An on-farm study
Hinz, Stracke, Schättler, Kemper, Spindler
Animals, 2019
Case study of an automatic enrichment device for laying hens on a free-range laying hen farm
Melanie Schmidt, Jenny Stracke, Katja Kulke, Nicole Kemper, Birgit Spindler
Agriculture Switzerland, 2019
Evaluation of a gait scoring system for cattle by using cluster analysis and Krippendorff's α reliability
Nina Volkmann, Jenny Stracke, Nicole Kemper
Veterinary Record, 2019
Foot pad health and growth performance in broiler chickens as affected by supplemental charcoal and fermented herb extract (FKE): An on-farm study
K. Hinz, J. Stracke, J.K. Schättler, B. Spindler, N. Kemper
European Poultry Science, 2019
Prevalence and severity of tail lesions as a possible welfare indicator for rabbit does
J Bill, SL Rauterberg, J Stracke, N Kemper, M Fels
Animal Welfare, 2019
Scratch the surface: Histopathology of foot pad dermatitis in turkeys
Precision Livestock Farming 2019 Papers Presented at the 9th European Conference on Precision Livestock Farming Ecplf 2019, 2019
First approach to validate a scoring system to assess footpad dermatitis in pekin ducks
L. Klambeck, J. Stracke, B. Spindler, D. Klotz, P. Wohlsein, et al.
European Poultry Science, 2019
A field study on the prevalence of and risk factors for endoparasites in beef suckler cow herds in Germany
Kathia Gillandt, Jenny Stracke, Tatiana Hohnholz, Ralf Waßmuth, Nicole Kemper
Agriculture Switzerland, 2018
First approach validating a scoring system for foot-pad dermatitis in broiler chickens developed for application in practice
Sophia Heitmann, Jenny Stracke, Henning Petersen, Birgit Spindler, Nicole Kemper
Preventive Veterinary Medicine, 2018
Dietary tryptophan supplementation and affective state in pigs
Jenny Stracke, Winfried Otten, Armin Tuchscherer, Maren Witthahn, Cornelia C. Metges, et al.
Journal of Veterinary Behavior Clinical Applications and Research, 2017
Serotonin depletion induces pessimistic-like behavior in a cognitive bias paradigm in pigs
Jenny Stracke, Winfried Otten, Armin Tuchscherer, Birger Puppe, Sandra Düpjan
Physiology and Behavior, 2017
An improved design for the spatial judgement task in domestic pigs
Sandra Düpjan, Jenny Stracke, Armin Tuchscherer, Birger Puppe
Applied Animal Behaviour Science, 2017

RECENT SCHOLAR PUBLICATIONS

Measuring Sleep in Farm Animals: Achievements and Challenges
SM Möseler, J Stracke
Applied Animal Behaviour Science, 106907 , 2025
2025
Effects of automated short-term incomplete milking during peak to mid lactation on udder firmness, heart-rate variability, and behavior recordings in dairy cows.
R Joest, J Stracke, U Müller
Applied Animal Behaviour Science, 106798 , 2025
2025
Do elevated platforms in the barn provide a positive effect on the footpad health of broiler chicken?
N Volkmann, F May, J Stracke, J Müsse, N Kemper, B Spindler
19th International Conference on Production Diseases in Farm Animals: ICPD … , 2025
2025
Nichttraumatischer prähospitaler Herz-Kreislauf-Stillstand bei einer Schwangeren
S Imach, J Stracke, C Adler, T Ahnert, C Domröse, S Banaschak, C Paul, ...
Notfall+ Rettungsmedizin 27 (5), 351-359 , 2024
2024
Nontraumatic out-of-hospital cardiac arrest in pregnant women. Example of treatment options and resource allocation in a German metropolitan area
S Imach, J Stracke, C Adler, T Ahnert, C Domroese, S Banaschak, C Paul, ...
NOTFALL & RETTUNGSMEDIZIN 27 (5), 351-359 , 2024
2024
Selbstkontrolle bei Schweinen im Zusammenhang mit Persönlichkeit und Sozialverhalten
M Kreiser, B Puppe, J Stracke, B Eusemann-Keller, S Düpjan
2024
Make some noise!: Vokalisation von Putenküken in einem Open Novel Objekt Test in Abhängigkeit vom Aufzuchtsystem (Ammenzucht vs. Handaufzucht)
J Stracke, M Bellersen, M Fölsing, L Drieling, J Ockenfels, N Kemper, ...
Aktuelle Arbeiten zur artgemäßen Tierhaltung 2024: Vorträge anläßlich der 56 … , 2024
2024
Shout it out loud: effects of the rearing system on vocalization of turkey chicks
J Stracke, M Bellersen, L Fölsing, L Lütge Drieling, J Ockenfels, N Kemper, ...
Book of abstracts of the 9th International Conference on the Welfare … , 2024
2024
Use of an elevated platform with perforated surface and manure belt by fast-growing broilers on commercial farms
F May, B Spindler, J Müsse, K Skiba, N Kemper, J Stracke
Poultry science 103 (1), 103243 , 2024
2024
Citations: 8
Elevated platforms for broilers on commercial farms: usage and effects on health and performance
J Stracke, F May, J Müsse, N Kemper, B Spindler
Book of Abstracts of the 74th Annual Meeting of the European Federation of … , 2023
2023
Effects of an elevated platform on behaviour and animal welfare indicators in broiler housing
B Spindler, F May, J Müsse, J Stracke, N Kemper
XXIInd Congress of the WVPA, Verona (Italy) September 4-8, 2023: Book of … , 2023
2023
Picken, Scharren, Staubbaden-Praxistest automatische Beschäftigung im Hühnermaststall
B Spindler, F May, N Kemper, J Stracke
Aktuelle Arbeiten zur artgemäßen Tierhaltung 2023: Vorträge anläßlich der 55 … , 2023
2023
Establishing elevated perforated platforms in broiler chicken housing: is hygiene a barrier?
B Sake, J Müsse, F May, J Stracke, N Kemper, J Schulz, B Spindler
Book of Abstracts of the 74th Annual Meeting of the European Federation of … , 2023
2023
Strukturierung und angepasste Fütterung im Masthühnerstall: Optionen für verhaltensgerechte und umweltschonende Haltung (MaVeTi)
J Müsse, F May, M Tillmanns, P Hiller, S Sagkob, L Diekmann, N Kemper, ...
Leistungs-und Qualitätsprüfungen sowie Projekte in der Tierhaltung … , 2023
2023
Is one annotation enough?-a data-centric image classification benchmark for noisy and ambiguous label estimation
L Schmarje, V Grossmann, C Zelenka, S Dippel, R Kiko, M Oszust, ...
Advances in Neural Information Processing Systems 35, 33215-33232 , 2022
2022
Citations: 70
A data-centric approach for improving ambiguous labels with combined semi-supervised classification and clustering
L Schmarje, M Santarossa, SM Schröder, C Zelenka, R Kiko, J Stracke, ...
European Conference on Computer Vision, 363-380 , 2022
2022
Citations: 29
Automatic detection of injuries in turkeys: dealing with the prerequisites for a consistent annotation assessment
N Volkmann, J Brünger, C Zelenka, J Stracke, B Spindler, R Koch, ...
Practical Precision Livestock Farming, 103-117 , 2022
2022
Citations: 3
ManyGoats–an initiative to promote open and reproducible research on goat behaviour and welfare
F Amici, O Atay, M Balaro, M Battini, D Brucks, HC Joao, R Daros, S David, ...
2022
Citations: 2
Sexual dimorphism in bone quality and performance of conventional broilers at different growth phases
J Müsse, H Louton, B Spindler, J Stracke
Agriculture 12 (8), 1109 , 2022
2022
Citations: 19
Keypoint detection for injury identification during turkey husbandry using neural networks
N Volkmann, C Zelenka, AM Devaraju, J Brünger, J Stracke, B Spindler, ...
Sensors 22 (14), 5188 , 2022
2022
Citations: 22

MOST CITED SCHOLAR PUBLICATIONS

Is one annotation enough?-a data-centric image classification benchmark for noisy and ambiguous label estimation
L Schmarje, V Grossmann, C Zelenka, S Dippel, R Kiko, M Oszust, ...
Advances in Neural Information Processing Systems 35, 33215-33232 , 2022
2022
Citations: 70
On-farm detection of claw lesions in dairy cows based on acoustic analyses and machine learning
N Volkmann, B Kulig, S Hoppe, J Stracke, O Hensel, N Kemper
Journal of dairy science 104 (5), 5921-5931 , 2021
2021
Citations: 46
Serotonin depletion induces pessimistic-like behavior in a cognitive bias paradigm in pigs
J Stracke, W Otten, A Tuchscherer, B Puppe, S Düpjan
Physiology & behavior 174, 18-26 , 2017
2017
Citations: 41
An improved design for the spatial judgement task in domestic pigs
S Düpjan, J Stracke, A Tuchscherer, B Puppe
Applied Animal Behaviour Science 187, 23-30 , 2017
2017
Citations: 39
First approach validating a scoring system for foot-pad dermatitis in broiler chickens developed for application in practice
S Heitmann, J Stracke, H Petersen, B Spindler, N Kemper
Preventive veterinary medicine 154, 63-70 , 2018
2018
Citations: 33
A data-centric approach for improving ambiguous labels with combined semi-supervised classification and clustering
L Schmarje, M Santarossa, SM Schröder, C Zelenka, R Kiko, J Stracke, ...
European Conference on Computer Vision, 363-380 , 2022
2022
Citations: 29
Automatic scoring system for monitoring foot pad dermatitis in broilers
H Louton, S Bergmann, A Piller, M Erhard, J Stracke, B Spindler, ...
Agriculture 12 (2), 221 , 2022
2022
Citations: 28
A field study on the prevalence of and risk factors for endoparasites in beef suckler cow herds in Germany
K Gillandt, J Stracke, T Hohnholz, R Waßmuth, N Kemper
Agriculture 8 (9), 132 , 2018
2018
Citations: 26
Histologically validated scoring system for the assessment of hock burn in broilers
H Louton, A Piller, S Bergmann, M Erhard, J Stracke, B Spindler, ...
Avian Pathology 49 (3), 230-242 , 2020
2020
Citations: 24
Validation of histological and visual scoring systems for foot-pad dermatitis in broiler chickens
A Piller, S Bergmann, A Schwarzer, M Erhard, J Stracke, B Spindler, ...
Animal welfare 29 (2), 185-196 , 2020
2020
Citations: 24
Effects of a slatted floor on bacteria and physical parameters in litter in broiler houses
S Heitmann, J Stracke, C Adler, MFE Ahmed, J Schulz, W Büscher, ...
Veterinary and animal science 9, 100115 , 2020
2020
Citations: 23
Keypoint detection for injury identification during turkey husbandry using neural networks
N Volkmann, C Zelenka, AM Devaraju, J Brünger, J Stracke, B Spindler, ...
Sensors 22 (14), 5188 , 2022
2022
Citations: 22
Dietary tryptophan supplementation and affective state in pigs
J Stracke, W Otten, A Tuchscherer, M Witthahn, CC Metges, B Puppe, ...
Journal of Veterinary Behavior 20, 82-90 , 2017
2017
Citations: 21
Sexual dimorphism in bone quality and performance of conventional broilers at different growth phases
J Müsse, H Louton, B Spindler, J Stracke
Agriculture 12 (8), 1109 , 2022
2022
Citations: 19
First approach to validate a scoring system to assess footpad dermatitis in Pekin ducks
L Klambeck, J Stracke, B Spindler, D Klotz, P Wohlsein, HG Schön, ...
European Poultry Science 83, 1-16 , 2019
2019
Citations: 16
Assessment of stress in laboratory beagle dogs constrained by a Pavlov sling
J Stracke, B Bert, H Fink, J Böhner
2011
Citations: 15
Evaluation of a gait scoring system for cattle by using cluster analysis and Krippendorff's α reliability
N Volkmann, J Stracke, N Kemper
Veterinary Record 184 (7), 220-220 , 2019
2019
Citations: 14
Learn to train: Improving training data for a neural network to detect pecking injuries in turkeys
N Volkmann, J Brünger, J Stracke, C Zelenka, R Koch, N Kemper, ...
Animals 11 (9), 2655 , 2021
2021
Citations: 13
Walking on tiptoes: digital pads deserve increased attention when scoring footpad dermatitis as an animal welfare indicator in turkeys
J Stracke, N Volkmann, F May, S Döhring, N Kemper, B Spindler
Frontiers in veterinary science 7, 613516 , 2021
2021
Citations: 12
Foot pad health and growth performance in broiler chickens as affected by supplemental charcoal and fermented herb extract (FKE): an on-farm study
K Hinz, J Stracke, JK Schättler, B Spindler, N Kemper
European Poultry Science 83, 1-13 , 2019
2019
Citations: 12

Jenny Stracke

RESEARCH, TEACHING, or OTHER INTERESTS

Scopus Publications

RECENT SCHOLAR PUBLICATIONS

MOST CITED SCHOLAR PUBLICATIONS