Animal Welfare Program, University of British Columbia, Vancouver, Canada.
J Dairy Sci. 2010 Dec;93(12):5758-63. doi: 10.3168/jds.2010-3426.
Cow gait, walking speed, time spent lying down, and distribution of weight among legs when standing during the week before and up to 5 wk after hoof trimming were assessed in 48 lactating Holstein cows housed in freestall pens to examine how changes in gait score following hoof trimming were correlated with other behavioral changes. Gait responses to hoof trimming varied between cows, with the majority showing no change or an increase in gait score. Walking speed was reduced after hoof trimming, and this decrease was maintained during the following 4 wk. The change in walking speed following hoof trimming negatively correlated with the change in gait (r = -0.33). Before hoof trimming, lame cows showed a greater standard deviation of the weight applied to the rear legs (38.4 vs. 27.2; standard error of the difference = 4.6). After hoof trimming, lame cows showed a quadratic increase in the standard deviation of the weight applied to the rear legs and the rear leg weight ratio, whereas no time trend existed for nonlame cows. The change in gait following hoof trimming was negatively correlated with the change in leg weight ratio (r = -0.44). Before hoof trimming, lame cows spent more time lying down each day than nonlame cows (801.7 vs. 731.7 min/d; standard error of the difference = 29.7). Both lame and nonlame cows increased the time they spent each day lying down after hoof trimming, and daily lying time remained higher for up to 5 wk after hoof trimming. The change in time spent lying down after hoof trimming was correlated with the change in gait (r = 0.30) and the change in leg weight ratio (r = -0.47). Using automated methods of lameness detection shows promise as a way of continuously monitoring animals to detect changes in behavior associated with the onset of or recovery from lameness.
在 48 头荷斯坦奶牛被安置在自由站立的畜栏中，以评估其在蹄修整前一周和之后的 5 周内的牛步态、行走速度、躺卧时间以及站立时腿部的重量分布，以研究蹄修整后步态评分的变化与其他行为变化之间的关系。步态评分的变化因牛而异，大多数牛的步态评分没有变化或增加。蹄修整后行走速度降低，且在接下来的 4 周内持续下降。蹄修整后行走速度的变化与步态的变化呈负相关(r = -0.33)。在蹄修整前，跛行牛后腿承受的重量的标准差较大(38.4 比 27.2；差异的标准误差= 4.6)。蹄修整后，跛行牛后腿承受的重量的标准差和后腿重量比呈二次增加，而非跛行牛则没有时间趋势。蹄修整后步态的变化与腿重比的变化呈负相关(r = -0.44)。在蹄修整前，跛行牛每天的躺卧时间比非跛行牛长(801.7 比 731.7 分钟/天；差异的标准误差= 29.7)。蹄修整后，跛行牛和非跛行牛每天的躺卧时间都增加了，且在蹄修整后 5 周内，每天的躺卧时间仍保持较高水平。蹄修整后躺卧时间的变化与步态的变化(r = 0.30)和腿重比的变化(r = -0.47)相关。使用跛行自动检测方法有望成为一种连续监测动物的方法，以检测与跛行发生或恢复相关的行为变化。
