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Identifying anomalous decreases in feeding time of grow-finish pigs
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: 10th International Livestock Environment Symposium (ILES X) .(doi:10.13031/iles.18-042)
Authors: F. Adrion, T. M. Brown-Brandl, D. Jones, E. Gallmann
Keywords: Feeding behavior, growing-finishing pigs, illness detection, linear model, z-score.
Abstract. Disruptions in feeding behavior can be indicative of a beginning illness and other impairments of animal well-being. The objectives of this study were to 1) develop an autoregressive linear model to predict daily feeding time of grow-finish pigs, 2) detect anomalous decreases in daily feeding time, and 3) compare the algorithm with animal caretaker records. The daily feeding time was collected with a low-frequency RFID system for a total of 2880 pigs over 12 different groups. Animal caretakers checked the pigs for health daily. Detected illness and subsequent treatments were recorded. Numerical computing software was used to develop an autoregressive linear model using an expanding and moving time window to predict daily time at the feeder for each pig. In a first step, the model and an algorithm using a z&-score threshold to detect large decreases were calibrated using caretakers‘ detections of pneumonia that were associated with severe drops in feeding time. The health warnings of the final model and algorithm were compared to the caretaker diagnoses in the reference feeding period. The algorithm detected 62 % of severe drops related to an illness event. However, the algorithm also resulted in a high number of false negatives (illness not detected) and false positives (alarm for a healthy animal). These results can be partly explained with the lack of a reliable and repeatable gold standard, but also reveal the potential of such a warning system to assist the animal caretaker to prevent unnecessary treatments of animals and also detect more illnesses.
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