Holzhauer M, Middelesch H, Bartels C J M, Frankena K, Verhoeff J, Noordhuizen-Stassen E N, Noordhuizen J P T M
GD Ltd., PO. Box 9, 7400AA Deventer, The Netherlands.
Tijdschr Diergeneeskd. 2005;130(14-15):440-3.
The optimal moment for trimming the claws of all dairy cows in a herd was investigated by assessing the external rotation of the hind claws of individual cows relative to the spinal column. This leg score consisted of three independent descriptors: 1 (good/normal), 2 (moderately deviant), and 3 (severely deviant). This study assessed the repeatability and the reproducibility of the leg score system, and the consistency of the advice given subsequently about trimming of the hind claws of all cows in the herd. Repeatability was assessed for 52 cows that were scored twice on the same day by 11 observers; the kappa value ranged from 0.17 to 0.66 (mean: 0.36). The probability of the same result for both assessments ranged from 0.49 to 0.80 (mean: 0.61). Claw trimming was advised if at least 20% of the cows had a leg score of 3. On the basis of the scores, 3 observers consistently advised trimming of the hind claws of all the cows in the herd, and 6 observers consistently advised against the need for trimming in the short term; 2 observers had an inconsistent advice. The reproducibility of the scoring system was assessed in two dairy herds (62 and 50 cows). Eight observers evaluated the leg score of the cows of both herds on the same day. The mean kappa value of the leg score for all pairs of different observers (A-B, A-C etcetera) was 0.24 [-0.08-0.49]. In conclusion, the leg score is not a reliable method for determining the optimal moment for claw trimming in dairy cattle. The reasons for the inconsistent observations require further investigation.
通过评估个体奶牛后爪相对于脊柱的外旋情况，对一群奶牛修剪爪子的最佳时机进行了研究。这种腿部评分由三个独立的描述符组成：1（良好/正常）、2（中度偏差）和3（严重偏差）。本研究评估了腿部评分系统的重复性和再现性，以及随后给出的关于修剪该群所有奶牛后爪的建议的一致性。对52头奶牛进行了重复性评估，11名观察者在同一天对其进行了两次评分；kappa值范围为0.17至0.66（平均值：0.36）。两次评估结果相同的概率范围为0.49至0.80（平均值：0.61）。如果至少20%的奶牛腿部评分为3，则建议进行爪子修剪。根据评分，3名观察者一致建议修剪该群所有奶牛的后爪，6名观察者一致建议短期内无需修剪；2名观察者的建议不一致。在两个奶牛群（分别有62头和50头奶牛）中评估了评分系统的再现性。8名观察者在同一天对两个牛群的奶牛腿部评分进行了评估。所有不同观察者对（A - B、A - C等）的腿部评分平均kappa值为0.24[-0.08 - 0.49]。总之，腿部评分不是确定奶牛爪子修剪最佳时机的可靠方法。观察结果不一致的原因需要进一步调查。
