Abstract

ObjectiveTo examine the use of handheld methodology to assess mechanical nociceptive threshold (MNT) on cows kept loose-housed.Study designProspective randomized partial cross-over experimental study. A one-factor (test day) design was used to evaluate MNT over time.AnimalsOne hundred and fifteen healthy, loose-housed Danish Holstein cattle.MethodsWe evaluated intra-individual variation, inter-observer agreement and variation over time of MNT using two handheld devices and two stimulation sites. Mechanical, ramped stimulations were performed with an algometer (6.5mm diameter steel probe, 0-10.0kgf) or an electronic von Frey device (plastic tip with diameter 0.8mm, 0-1000gf). Each cow received 5-6 consecutive stimulations within a 2x5cm skin area on the dorsal or lateral aspect of the left third metatarsus until an avoidance reaction occurred. We investigated the difference in precision [expressed as coefficient of variation (CV)] between the combinations of devices and stimulation sites. The inter-observer agreement and the difference in MNT between test day 1, 3, 7, 10 and 24 were investigated for selected combinations. Data were analysed in mixed models and Bland-Altman as relevant.ResultsThe CVs did not differ [range 0.34-0.52 (p=0.1)]. Difference between observers (95% limits) was 0.2kgf (2.8) and 4gf (369) for the algometer and von Frey device, respectively. Mechanical nociceptive threshold increased from 361 on test day one to 495gf on test day 24 (p<0.01).Conclusion and clinical relevanceAll methods showed a high degree of intra-individual variation, and no combination of device and stimulation site showed superior precision. Mean difference between observers was low, and MNT was not consistent over time. Further development of the methods is required before they can be used in research to investigate possible relations between claw lesions and hyperalgesia.

Keywords

dairy cows; mechanical nociceptive threshold; pain

Published in

Veterinary Anaesthesia and Analgesia
2014, Volume: 41, number: 6, pages: 660-669
Publisher: WILEY-BLACKWELL

SLU Authors

• Haubro Andersen, Pia

  • Department of Clinical Sciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Clinical Science


Publication identifier

DOI: https://doi.org/10.1111/vaa.12159

Permanent link to this page (URI)

https://res.slu.se/id/publ/68265