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Geographical and seasonal variation in iodine content of cow's milk in the UK and consequences for the consumer´s supply.
Journal of Trace Elements in Medicine and Biology ( IF 3.5 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.jtemb.2020.126453
Lisa J Coneyworth 1 , Lauren C H A Coulthard 1 , Elizabeth H Bailey 2 , Scott D Young 2 , Jonathan Stubberfield 1 , Louise Parsons 1 , Neil Saunders 3 , Eamon Watson 4 , Elizabeth M Homer 5 , Simon J M Welham 1
Affiliation  

BACKGROUND Dairy products provide a crucial source of dietary iodine for the majority of the UK population, contributing approximately 30-40 % of daily intake. Fluctuations in the iodine content of purchased milk both seasonally and annually implies potential fragility of iodine supply likely through fluctuating supplementation practices in cow herds. We set out to establish the level of national variation in herds and identify factors which might impact milk iodine content. METHODS Milk samples were obtained from 98 herds across the UK via the National Milk Laboratories in August and December 2016. Iodine concentration of samples was measured using ICP-MS. Milk samples and feed intake data were additionally taken from 22 cows from the University of Nottingham (UON) dairy herd. RESULTS There was considerable variation in milk iodine content from < 0.012 (Limit of Detection) to 1558 μg L-1, with a summer median of 197 μg L-1 and winter median 297 μg L-1. Overall, winter values were higher than summer counterparts (P < 0.001) and this held true for samples taken from the North West (P = 0.002) and South West (P = 0.006) but not for other regions studied. Data from the UON herd showed a negative relationship between iodine content and milk yield (P = 0.03) and we found that milk iodine content varied considerably despite apparently similar iodine intakes. CONCLUSIONS Regional differences in milk iodine concentration between summer and winter suggests that feeding practices are far from uniform across the country. The negative association observed between iodine concentration and milk yield in UON samples, suggests that reduced summer values may be influenced by dilution in addition to seasonal differences in concentrate feed provision.

中文翻译:

英国牛奶中碘含量的地域和季节变化以及对消费者供应的影响。

背景技术乳制品为大多数英国人口提供了重要的饮食碘,每天约占其摄入量的30-40%。季节性和逐年购买的牛奶中碘含量的波动暗示着牛奶供应量的波动可能是由于奶牛补习方式的波动造成的。我们着手确定全国牛群差异水平,并确定可能影响牛奶碘含量的因素。方法2016年8月和2016年12月,通过英国国家牛奶实验室从英国98个牛群中采集牛奶样品。使用ICP-MS测定样品中的碘浓度。此外,还从诺丁汉大学(UON)奶牛场的22头奶牛中采集了牛奶样品和饲料摄入量数据。结果乳碘含量从<0.012(检出限)到1558μgL-1有很大的差异,夏季中位数为197μgL-1,冬季中位数为297μgL-1。总体而言,冬季值高于夏季值(P <0.001),这适用于从西北(P = 0.002)和西南(P = 0.006)采集的样本,但对于其他研究区域则没有。UON牛群的数据显示碘含量与牛奶产量之间呈负相关关系(P = 0.03),我们发现尽管摄入的碘量明显相似,但牛奶中的碘含量变化很大。结论夏季和冬季之间牛奶碘浓度的区域差异表明,全国各地的喂养方式均不一致。在UON样品中观察到的碘浓度与产奶量之间呈负相关,
更新日期:2020-01-11
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