Hernandez Jorge A, Garbarino Eduardo J, Shearer Jan K, Risco Carlos A, Thatcher William W
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0136, USA.
J Am Vet Med Assoc. 2005 Oct 15;227(8):1292-6. doi: 10.2460/javma.2005.227.1292.
To compare milk yield among cows classified as nonlame, moderately lame, and lame and to examine the relationship between severity of lameness and milk yield in cows classified as lame during the first 100 days after parturition.
Longitudinal study.
465 Holstein cows.
Cows were examined weekly during the first 100 days after parturition and assigned a lameness score by use of a 6-point locomotion scoring system (ie, 0 to 5). Milk yield was compared among cows classified as nonlame, moderately lame, and lame. Among cows classified as lame (locomotion score > or = 4), milk yield was compared for cows with low, medium, and high cumulative locomotion scores. Cows classified as lame were further examined on a tilt table for diagnosis and treatment of lameness.
84 (18%), 212 (46%), and 169 (36%) cows were classified as nonlame, moderately lame, and lame, respectively. Among cows in their second or later lactations, milk yield in lame cows was significantly lower than that in moderately lame and nonlame cows. In addition, among cows classified as lame, milk yield was significantly lower in cows with high locomotion scores during the first 100 days after parturition, compared with cows with low scores. Most (58%) cows classified as lame had laminitis.
Results indicate a linear relationship between increasing degree of lameness and decreasing milk yield among cows in their second or later lactations. The locomotion scoring system used in this study may be a useful management tool that veterinarians and dairy farmers could adopt for early detection of lameness in dairy cows.
比较非跛足、中度跛足和跛足奶牛的产奶量，并研究分娩后前100天内跛足奶牛的跛足严重程度与产奶量之间的关系。
纵向研究。
465头荷斯坦奶牛。
在分娩后的前100天内每周对奶牛进行检查，并使用6分制运动评分系统（即0至5分）对其进行跛足评分。比较非跛足、中度跛足和跛足奶牛的产奶量。在被分类为跛足（运动评分≥4）的奶牛中，比较累积运动评分低、中、高的奶牛的产奶量。对被分类为跛足的奶牛在倾斜台上进行进一步检查，以诊断和治疗跛足。
分别有84头（18%）、212头（46%）和169头（36%）奶牛被分类为非跛足、中度跛足和跛足。在第二胎或更高胎次的奶牛中，跛足奶牛的产奶量显著低于中度跛足和非跛足奶牛。此外，在被分类为跛足的奶牛中，与低分奶牛相比，分娩后前100天内运动评分高的奶牛产奶量显著较低。大多数（58%）被分类为跛足的奶牛患有蹄叶炎。
结果表明，在第二胎或更高胎次的奶牛中，跛足程度增加与产奶量降低之间存在线性关系。本研究中使用的运动评分系统可能是兽医和奶农可采用的一种有用的管理工具，用于早期检测奶牛跛足。
