Geishauser T, Querengässer K, Nitschke M, Sorbiraj A
Department of Population Medicine, University of Guelph, Ontario, Canada.
J Dairy Sci. 1999 Jul;82(7):1482-8. doi: 10.3168/jds.S0022-0302(99)75375-0.
The objective of this study was to evaluate milk yield, somatic cell count (SCC), and risk of removal of a cow from the herd after covered teat injury. Teat injuries were diagnosed and treated by using endoscopy. After treatment, teats were rested for 3 x 3 d. Eighty-one cows referred to the Veterinary Clinic Babenhausen were used for this study. Each cow was matched to three herdmates by breed, age, and calving date. Data on milk yield and SCC were available from the records of the Bavarian milk control board. Test day milk yields and lactational milk yields were equal for cows with covered teat injury and herdmates in the lactation when the injury was diagnosed and in the subsequent lactation. Calving interval in the year the injury was diagnosed and the time cows lived in the herd were also equal. However, covered teat injuries significantly increased test day SCC by 128,000 cells/ml of milk. These injuries also significantly increased the odds of subclinical mastitis (SCC > 100,000 on test day) and the odds of violating European milk shipping regulations (SCC > 400,000 on test day). Because increased SCC was significantly associated with decreased milk yield, cows may not have fully utilized their milk yield capacity after covered teat injury.
本研究的目的是评估封盖乳头损伤后奶牛的产奶量、体细胞计数（SCC）以及从牛群中被淘汰的风险。乳头损伤通过内窥镜检查进行诊断和治疗。治疗后，乳头休息3×3天。本研究使用了转诊至巴本豪森兽医诊所的81头奶牛。每头奶牛根据品种、年龄和产犊日期与三头同群奶牛进行匹配。产奶量和SCC数据可从巴伐利亚牛奶控制委员会的记录中获取。封盖乳头损伤的奶牛及其同群奶牛在损伤诊断时的泌乳期以及随后的泌乳期的测定日产奶量和全泌乳期产奶量相等。损伤诊断当年的产犊间隔以及奶牛在牛群中的存活时间也相等。然而，封盖乳头损伤使测定日SCC显著增加了128,000个细胞/毫升牛奶。这些损伤还显著增加了亚临床乳腺炎（测定日SCC>100,000）的几率以及违反欧洲牛奶运输规定（测定日SCC>400,000）的几率。由于SCC增加与产奶量下降显著相关，封盖乳头损伤后的奶牛可能未充分发挥其产奶能力。
