Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
The operation mode determines the optimal settings for different parameters of agricultural vehicles. A classification of road mode and field mode is essential for adapting settings, e.g. the automatic adjustment of tire inflation during transport on road and operational field work. This study focuses on the development and application of algorithms for automatically detecting the operation mode of agricultural vehicles based on GNSS data. The approach is solely based on the parameters speed, COG and derived values such as acceleration, curve radius and angular speed. Known field boundaries and the current position of the vehicle have been neglected to increase the flexibility and applicability of the algorithm. For this purpose the GNSS data were collected with two GNSS receivers differing with respect to model and correction data source (EGNOS and RTK). Speed, time, heading and derived parameters were included in the development of a decision tree based model to classify the operating mode using the rpart package in RStudio. The prediction of operating mode was carried out with the predict package in RStudio. A confusion matrix was introduced to validate the performance of different models. The algorithms derived from the two training datasets (EGNOS and the RTK dataset) show convincing results in the detection of road and field mode. Both algorithms demonstrated an accuracy of more than 90%. The prediction performance was improved when training and validation data were derived from the same dataset (either EGNOS or RTK dataset). The comparison of two algorithms based on EGNOS and RTK data reveal the advantage of models based on RTK data. It is of great importance that the number of wrong decisions regarding the detection of the operating mode on the road are minimized since road safety plays an important role and the potential harm caused by a wrong decision is substantially higher than in the field. The method reveals a large potential for other applications where the operating mode is relevant.
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Prof. Dr. Bernhard Bauer,
M.Sc. Kevin Braun,
Prof. Dr. Peter Breunig,
B.Eng. Andreas Fleischmann,
Tobias Meyer,
Prof. Dr. Patrick Noack,
M.Sc. Muhammad Saeed,
M.Sc. Rolf Wilmes
Dr. Ute Appeltauer-Brandl,
Sebastian Burkhart,
Julia Helfert,
Jürgen Niederstraßer,
Prof. Dr. Patrick Noack,
Prof. Dr. Iryna Smetanska,
Sophia Trautmann
Research investigating necrotic tail tips in dairy cows resulting in necrotic tissues is scarce. However, there is evidence that in dairy cattle tail tip necroses exist with high prevalence. In piglets, the latest research described tail and ear necroses not because of tail and ear biting only, but because of swine inflammation and necrosis syndrome (SINS). Besides tails and ears, SINS includes inflammation of claws, heels, and teats. In cattle, tail tip necroses are described mainly in fattening bulls. As known so far, these findings are often discussed related to slatted flooring, intensive housing systems and management strategies. However, an association with subacute rumen acidosis and laminitis is described. In order to investigate what kind of and how often tail tip alterations appear in dairy cattle, data of 87 German Holstein dairy cows were collected over a period of 12 months. All cows were evaluated for tail tip alterations, body condition score (BCS), and locomotion score (LMS) every two weeks. In addition, milk yield data resulting from performance testing were included. Thermographic images of the tails were taken once. Firstly, all kind of tail tip alterations were described and collected. After 6 months, we categorized the observed alterations and developed a tail scoring system. The scoring for each specified trait (tail tip, tail ring) ranged from 0 to 4. The overall prevalence for tail alterations was 94%. Especially tail tip alterations had a constantly high prevalence of 56%. Cows affected by an increased average tail tip score, showed higher locomotion scores compared to others (P = 0.02). The prevalence of ring-like tail alterations increased from first to second lactation cows from 9 to 46%. Regarding the BCS, lighter cows showed higher scores due to ring-like alterations than heavier cows (P = 0.054). The most often occurring anomalies of the tail were sports or scurf (21.6%), followed by verruca-like mass (10.2%), swelling (8.4%), and thinning (4.3%). The results and especially the scoring system can serve as a template for further studies considering larger samples sizes, to investigate prevalence for tail necroses and other tail anomalies in different herds and management systems. It was hypothesized, that an inflammatory condition in dairy cows showing up in altered/necrotic tail tips or rings exists, which is in relationship with claw disorders indicated by lameness. If so, the tail score of a cow could be used as health indicator to evaluate the health status in dairy production systems.
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Prof. Dr. Iryna Smetanska,
Diaa Mamdouh Ahmed Mohammed,
Oksana Tonkha
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