Hernandez Jorge, Shearer Jan K, Webb Daniel W
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610-0136, USA.
J Am Vet Med Assoc. 2002 Mar 1;220(5):640-4. doi: 10.2460/javma.2002.220.640.
To examine the relationship between lameness and milk yield in dairy cows.
Cohort study.
531 dairy cows.
Cows affected with lameness were classified into 1 of 3 groups on the basis of type of diseases or lesions observed, including interdigital phlegmon (foot rot), papillomatous digital dermatitis (foot warts), or claw lesions. Cows not affected with lameness were classified as healthy. From Dairy Herd Improvement Association records, 305-day mature equivalent milk yield data were collected at the end of lactation or when the cow left the herd. Milk yield was compared between cows affected with lameness and healthy cows.
167 (31%) cows were affected with lameness during lactation. Lame cows had claw lesions (60%), papillomatous digital dermatitis (31%), or interdigital phlegmon (9%). Milk yield in lame cows with interdigital phlegmon (mean, 17,122 lb) was significantly less, compared with healthy cows (19,007 lb).
In this herd, interdigital phlegmon was associated with a 10% decrease in milk production. Lame cows with claw lesions or papillomatous digital dermatitis produced less milk than healthy cows, but the difference was not significant.
研究奶牛跛行与产奶量之间的关系。
队列研究。
531头奶牛。
根据观察到的疾病或病变类型，将患跛行的奶牛分为3组之一，包括趾间蜂窝织炎（腐蹄病）、乳头瘤状指皮炎（蹄疣）或蹄爪病变。未患跛行的奶牛被归类为健康奶牛。从奶牛改良协会记录中，在泌乳期末或奶牛离群时收集305天成熟当量产奶量数据。比较患跛行的奶牛和健康奶牛的产奶量。
167头（31%）奶牛在泌乳期患跛行。跛行奶牛有蹄爪病变（60%）、乳头瘤状指皮炎（31%）或趾间蜂窝织炎（9%）。与健康奶牛（19,007磅）相比，患趾间蜂窝织炎的跛行奶牛产奶量（平均17,122磅）显著较低。
在该牛群中，趾间蜂窝织炎与产奶量下降10%有关。有蹄爪病变或乳头瘤状指皮炎的跛行奶牛产奶量低于健康奶牛，但差异不显著。
