Funk Lucas D, Reecy James M, Wang Chong, Tait Richard G, O'Connor Annette M
Department of Veterinary Diagnostics and Production Animal Medicine, College of Veterinary Medicine, and the Department of Animal Science, College of Agriculture and Life Sciences, Iowa State University, Ames, IA 50011.
J Am Vet Med Assoc. 2014 Jan 1;244(1):100-6. doi: 10.2460/javma.244.1.100.
To assess associations between infectious bovine keratoconjunctivitis (IBK) diagnosed at weaning and production traits in yearling beef calves.
Retrospective population-based cohort study.
1,882 Angus calves.
Angus calves from 1 farm were evaluated over 7 years. The association between yearling body production traits and detection of IBK lesions at weaning was evaluated.
Yearlings that had evidence of IBK at weaning had less 12th rib fat depth, ribeye area, and body weight than did cohorts without evidence of IBK. Average daily gain was greater in cattle that had IBK lesions at weaning, but this did not offset lower body weight at weaning.
The associations between IBK at weaning and production variables persisted well into the postweaning period, and there appeared to be a relationship between decreased body composition traits at yearling evaluation and IBK infection before weaning.
评估断奶时诊断出的传染性牛角膜结膜炎（IBK）与一岁肉牛犊生产性状之间的关联。
基于人群的回顾性队列研究。
1882头安格斯犊牛。
对来自1个农场的安格斯犊牛进行了7年的评估。评估了一岁时的身体生产性状与断奶时IBK病变检测之间的关联。
断奶时有IBK证据的一岁犊牛，其第12肋骨处的脂肪深度、眼肌面积和体重均低于无IBK证据的同龄组。断奶时有IBK病变的牛平均日增重更高，但这并未抵消断奶时较低的体重。
断奶时的IBK与生产变量之间的关联在断奶后时期持续存在，并且在一岁评估时身体组成性状下降与断奶前的IBK感染之间似乎存在关联。
