A lameness scoring system that uses posture and gait to predict dairy cattle reproductive performance
A lameness scoring system that uses posture and gait to predict dairy cattle reproductive performance
复制标题
DOI：
10.1016/s0093-691x(97)00098-8
复制
发表时间：
1997-04-15
期刊：
影响因子：
2.8
通讯作者：
Kaneene, JB
中科院分区：
文献类型：
--
作者：
Sprecher, DJ;Hostetler, DE;Kaneene, JB
跛行导致奶牛繁殖效率低下，并增加了被扑杀的风险。我们开发了一个5分的跛行评分系统来评估步态，并对背部姿势进行了新的强调。我们的目标是确定这个系统是否能预测未来的繁殖性能和被淘汰的风险。该研究是在一个商业奶牛场进行的，该农场有繁殖效率下降和跛行的历史。共有66例初产妇和产后分娩，接受了初始跛行评分，并完成了60天的自愿等待期。跛行总体患病率（平均跛行评分bb0.2）为65.2%。评分每隔4周进行一次，并在受孕或淘汰时停止。确认怀孕和被扑杀的奶牛比例分别为77.3和22.7%。对于每个生殖终点，构建一个2 × 2的表，其中跛行评分>2作为阳性危险因素，其表现大于终点平均值或被剔除为阳性疾病或状况。采用阳性预测值和阴性预测值、相对危险度、卡方统计和回归分析对数据进行评价。首次服务天数、开放天数、种畜天数、单胎服务天数和被扑杀天数的阳性预测值分别为58%、68%、65%、39%和35%。阴性预测值分别为79、96、100、96、100%。除1个生殖终点服务数外，其余线性回归均显著（P < 0.01）。跛行评分为bbb20的奶牛从产犊到初次服务再到受孕的间隔时间更长，在繁殖群中花费或被分配（在这里解释）的总天数更长，每次怀孕需要更多的服务，被淘汰的可能性增加8.4倍。我们相信这个跛行评分系统可以有效地识别跛行奶牛。观察站牛的弓背姿势（大于或等于LS 3）应该触发纠正措施。(C) 1997年由爱思唯尔科学公司
Lameness has contributed to reproductive inefficiency and increased the risk of culling in dairy cows. We developed a 5-point lameness scoring system that assessed gait and placed a novel emphasis on back posture. Our objective was to determine if this system predicted future reproductive performance and the risk of culling. The study was conducted at a commercial dairy farm with a history of declining reproductive efficiency and an increasing prevalence of lameness. A total of 66 primipara and pluripara calved, received an initial lameness score, and completed their 60-d voluntary waiting period. The overall prevalence of lameness (mean lameness score >2) was 65.2%. Scoring continued at 4-wk intervals and ceased with conception or culling. The percentage of cows confirmed pregnant and culled was 77.3 and 22.7, respectively.For each reproductive endpoint, a 2 x 2 table was constructed with lameness score >2 as the positive risk factor and either performance greater than the endpoint mean or being culled as the positive disease or condition. Positive and negative predictive values, relative risk, Chi-square statistic and regression analysis were used to evaluate the data. The positive predictive values for days to first service, days open, breeding herd days, services per pregnancy and being culled were 58, 68, 65, 39 and 35%, respectively. Similarly, the negative predictive values were 79, 96, 100, 96 and 100%, respectively. Except for one reproductive endpoint, the total number of services, all linear regressions were significant at P < 0.01. Having a lameness score >2 predicted that a cow would have extended intervals from calving to first service and to conception, spend or be assigned to (explained herein) more total days in the breeding herd, require more services per pregnancy and be 8.4 times more likely to be culled. We believe that this lameness scoring system effectively identifies lame cows. Observation of the arched-back posture in a standing cow (greater than or equal to LS 3) should trigger corrective interventions. (C) 1997 by Elsevier Science Inc.