The use of an activity monitoring system for the early detection of health disorders in young bulls
Belaid, Mohammed Anouar (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Rodríguez-Prado, María (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Chevaux, Eric (Lallemand SAS. R&D Animal Nutrition)
Calsamiglia, Sergio (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)

Date:	2019
Abstract:	Bulls (n = 770, average age = 127 days, SD = 53 days of age) were fitted with an activity monitoring device for three months to study if behavior could be used for early detection of diseases. The device measured the number of steps, lying time, lying bouts, and frequency and time of attendance at the feed bunk. All healthy bulls (n = 699) throughout the trial were used to describe the normal behavior. A match-pair test was used to assign healthy bulls for the comparison vs. sick bulls. The model was developed with 70% of the data, and the remaining 30% was used for the validation. Healthy bulls did 2422 ± 128 steps/day, had 28 ± 1 lying bouts/day, spent 889 ± 12 min/day lying, and attended the feed bunk 8 ± 0. 2 times/d for a total of 95 ± 8 min/day. From the total of bulls enrolled in the study, 71 (9. 2%) were diagnosed sick. Their activities changed at least 10 days before the clinical signs of disease. Bulls at risk of becoming sick were predicted 9 days before clinical signs with a sensitivity and specificity of 79% and 81%, respectively. The validation of the model resulted in a sensitivity, specificity, and accuracy of 92%, 42%, and 82 %, respectively, and a 50% false positive and 12. 5% false negative rates. Results suggest that activity-monitoring systems may be useful in the early identification of sick bulls. However, the high false positive rate may require further refinement.
Grants:	Ministerio de Economía y Competitividad AGL2015-67409
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Beef cattle ; Activity monitoring ; Behavior ; Diseases
Published in:	Animals, Vol. 9 Núm. 11 (november 2019) , p. 924, ISSN 2076-2615

DOI: 10.3390/ani9110924
PMID: 31694292

11 p, 1.4 MB

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