Plate Peter, van Winden Steven
Farm Animal Health and Production Group, Department for Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, Hatfield, Hertfordshire AL9 7TA, UK.
Animals (Basel). 2023 Jul 15;13(14):2318. doi: 10.3390/ani13142318.
(1) Background: Selective dry cow therapy is widely promoted in many countries worldwide, however, concerns have been raised about the consequences of the unhygienic application of preparations by untrained operators, especially if no antimicrobials are being used, risking deteriorating mastitis outcomes. (2) Method: This study follows up on cows being dried off by farm staff and those dried off by final-year veterinary students and first-year graduate interns in a supervised training session. Subsequent mastitis parameters and culling data in a single herd with a low somatic cell count were evaluated. (3) Results: A total of 316 dry periods were enrolled in the study. There was no significant difference in the percentage of cows showing at least one high SCC reading within 90 days of the following lactation or cows with at least one case of clinical mastitis within the same period, neither in the total nor in the subset of cows dried off without an antimicrobial. Dry period cure rates and dry period new infection rates were similar too, as was the percentage of cows surviving in the herd after six months. The risk of culling within twelve months post-drying off was lower in cows dried off by students, the difference in survival manifesting itself from 150 days post-drying off, which is an unexplained finding. (4) Conclusion: Well-supervised practical training sessions on drying off routine can be responsibly implemented on well-managed commercial dairy herds.
(1) 背景：选择性干奶疗法在世界许多国家得到广泛推广，然而，人们对未经培训的操作人员不卫生地使用制剂的后果表示担忧，特别是在不使用抗菌药物的情况下，这可能会导致乳腺炎病情恶化。(2) 方法：本研究对农场工作人员进行干奶处理的奶牛以及在监督培训课程中由兽医专业最后一年学生和第一年研究生实习生进行干奶处理的奶牛进行了跟踪。评估了体细胞计数较低的单一牛群中随后的乳腺炎参数和淘汰数据。(3) 结果：本研究共纳入316个干奶期。在下一个泌乳期90天内出现至少一次高体细胞计数读数的奶牛百分比，或同期至少有一例临床乳腺炎的奶牛百分比，在总体上以及在不使用抗菌药物进行干奶处理的奶牛子集中均无显著差异。干奶期治愈率和干奶期新感染率也相似，干奶后六个月内牛群中存活奶牛的百分比也相似。由学生进行干奶处理的奶牛在干奶后十二个月内被淘汰的风险较低，这种存活差异在干奶后150天开始显现，这是一个无法解释的发现。(4) 结论：在管理良好的商业奶牛群中，可以负责任地开展关于干奶常规的监督良好的实践培训课程。
