Ceballos-Márquez Alejandro, Barkema Herman W, Stryhn Henrik, Dohoo Ian R, Keefe Gregory P, Wichtel Jeffrey J
Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island C1A 4P3.
Can Vet J. 2012 Jan;53(1):51-6.
An observational study was conducted in 63 Canadian dairy farms to evaluate the association of bulk tank milk selenium (Se) concentration (BTSe) with average daily milk yield, milk fat and milk protein, bulk tank somatic cell count (BTSCC), and the probability of being a Staphylococcus aureus-positive herd. Bulk tank milk samples collected between March 2007 and February 2008 were evaluated for BTSCC, S. aureus culture status, and BTSe. Mean BTSe was 0.51 ± 0.15 μmol/L; no herds were classified as deficient or marginal based on BTSe. Bulk tank milk Se was unconditionally associated with milk production; however, adjusting by region indicated a confounding effect of this variable. There was no relationship between BTSe and BTSCC. Higher values of BTSe were associated with lower risk of being a S. aureus-positive herd, possibly as a result of a more robust udder immune response, or as a result of providing Se at a higher rate as one component of an udder health program that reduces risk of being S. aureus positive.
在63个加拿大奶牛场进行了一项观察性研究，以评估奶罐奶中硒（Se）浓度（BTSe）与平均日产奶量、乳脂和乳蛋白、奶罐体细胞计数（BTSCC）以及金黄色葡萄球菌阳性牛群概率之间的关联。对2007年3月至2008年2月期间采集的奶罐奶样品进行了BTSCC、金黄色葡萄球菌培养状况和BTSe评估。平均BTSe为0.51±0.15μmol/L；基于BTSe，没有牛群被分类为缺乏或边缘状态。奶罐奶中的硒与产奶量无条件相关；然而，按地区进行调整表明该变量存在混杂效应。BTSe与BTSCC之间没有关系。较高的BTSe值与金黄色葡萄球菌阳性牛群的较低风险相关，这可能是由于更强大的乳房免疫反应，或者是由于作为乳房健康计划的一个组成部分以更高的速率提供硒，从而降低了金黄色葡萄球菌阳性的风险。
