Interobserver agreement of digital dermatitis M-scores for photographs of the hind feet of standing dairy cattle.

Autor:	Vanhoudt A; Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3584 CL, Utrecht, the Netherlands. Electronic address: a.vanhoudt@uu.nl., Yang DA; School of Veterinary Science, Massey University, Palmerston North 4474, New Zealand., Armstrong T; Provita Eurotech Limited, Omagh, County Tyrone, BT79 0EU, Northern Ireland., Huxley JN; School of Veterinary Science, Massey University, Palmerston North 4474, New Zealand., Laven RA; School of Veterinary Science, Massey University, Palmerston North 4474, New Zealand., Manning AD; School of Veterinary Medicine, University of Surrey, Guildford GU2 7AL, United Kingdom., Newsome RF; Cattle Lameness Academy, Synergy Farm Health Ltd., Evershot, Dorset, DT2 0LD, United Kingdom., Nielen M; Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3584 CL, Utrecht, the Netherlands., van Werven T; Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3584 CL, Utrecht, the Netherlands; University Farm Animal Practice, 3481 LZ, Harmelen, the Netherlands., Bell NJ; School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Leicestershire, LE12 5RD, United Kingdom.
Jazyk:	angličtina
Zdroj:	Journal of dairy science [J Dairy Sci] 2019 Jun; Vol. 102 (6), pp. 5466-5474. Date of Electronic Publication: 2019 Apr 04.
DOI:	10.3168/jds.2018-15644
Abstrakt:	Digital dermatitis (DD) is the leading infectious cause of lameness in dairy cattle, and it affects their welfare and productivity worldwide. At the herd level, DD is often assessed while cows are standing in a milking parlor, and lesions are most commonly evaluated using the M-score. The objective of this study was to examine the interobserver agreement for M-scores of the feet of standing cattle, based on digital color photographs of dairy cattle hind feet. A total of 88 photographs and written descriptors of the M-score were sent to 11 scorers working at 10 different institutions in 5 countries. The scorers received no formal training immediately before scoring the photographs; however, all regularly used the M-score to score DD. The answers for 36 photographs were excluded from the analysis because the photograph either had more than 1 M-stage as mode or not all scorers assigned an M-score to it. The M-scores of the 11 scorers from 52 photographs were available for analysis. Interobserver agreement was tested using Gwet's agreement coefficient (AC1) and the mode was assumed correct. Overall, moderate agreement emerged for the M-score (AC1 = 0.48). For the individual M-stages, almost perfect agreement existed for M0 (AC1 = 0.99), M1 (AC1 = 0.92), and M3 (AC1 = 0.82), and substantial agreement for M2 (AC1 = 0.61), M4 (AC1 = 0.65), and M4.1 (AC1 = 0.71). This outcome indicates the degree of individual variation in M-scoring in this context by unstandardized, experienced European observers, particularly for the M2, M4, and M4.1 stages. Standardized training is likely to improve the consistency of M-scoring and thus the generalizability of future DD research results on this important endemic disease. (Copyright © 2019 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu