IDEAS home Printed from https://ideas.repec.org/a/caa/jnlcjs/v51y2006i5id3928-cjas.html
   My bibliography  Save this article

Iodine concentrations in cow's milk in Central and Northern Bohemia

Author

Listed:
  • A. Hejtmánková

    (Faculty of Agrobiology, Food and Natural resources, Czech University of Agriculture, Prague, Czech Republic)

  • L. Kuklík

    (Faculty of Agrobiology, Food and Natural resources, Czech University of Agriculture, Prague, Czech Republic)

  • E. Trnková

    (Faculty of Agrobiology, Food and Natural resources, Czech University of Agriculture, Prague, Czech Republic)

  • H. Dragounová

    (Faculty of Agrobiology, Food and Natural resources, Czech University of Agriculture, Prague, Czech Republic)

Abstract

Iodine deficiency and related risks of medical and/or developmental disorders in humans are a worldwide problem. In the last years, Czech endocrinologists and paediatricians have observed a significant increase in the occurrence of goitre in children and adolescents caused by a low dietary intake of iodine. Given the low consumption of seafood, milk and dairy products are the main sources of iodine in theCzechRepublic. Iodine contents of milk of dairy cows of different breeds from seven farms located in Central andNorthern Bohemia were studied over a period of 17 months (April 2000 through August 2001). Iodine content was determined by high-performance liquid chromatography with electrochemical detection (HPLC-ECD) based on IDF Standard 167 (1994), following alkaline mineralization of the sample. An analysis of the certified reference material CRM 063 was used to examine the accuracy of determination. Two-way analysis of variance (ANOVA) with and without replications, including Scheffe's comparison at a 5% level of significance, was used for statistical evaluation of experimental data. The iodine content of milk ranged from 147 to 605 µg/kg (mean 251 110 µg/kg) during the winter season, and from 35 to 484 µg/kg (mean 212 104 µg/kg) during the summer season. The mean iodine concentration in all samples of milk during the studied period was 225 109 μg/kg.The wide range of iodine concentrations is connected with differences in iodine saturation of dairy cows and it is a result of multiple factors. Iodine reserves in the soil play an important role and influence the content of iodine in feeds for dairy cows and thereby the iodine levels in milk. The presence of goitrogenic substances in feed for dairy cows is another important factor. The iodine content was found to be statistically significantly lower in the milk from dairy cows fed a diet enriched with rapeseed cakes compared to that of dairy cows on a diet without rapeseed cake. Dairy cows on farm F6, which were fed maize silage without added rapeseed cake during winter, had a statistically higher iodine content in milk during the winter season compared to summer, when they were fed fresh fodder. Fresh fodder is supposed to contain goitrogenic substances which significantly reduce iodine levels in milk. This opinion is supported by experimental findings that the date of milk sample collection has no statistically significant influence on milk iodine levels if the dairy cows are fed a diet containing added rapeseed cake (farms F1, F2, F3, and F4) throughout the year. Compared to the other farms, statistically significantly higher milk iodine content was found on farm F5. The mean iodine content in milk from farm F5 was 425 74 μg/kg during the studied period. The main cause is probably that the diet contained no rapeseed cake.

Suggested Citation

  • A. Hejtmánková & L. Kuklík & E. Trnková & H. Dragounová, 2006. "Iodine concentrations in cow's milk in Central and Northern Bohemia," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 51(5), pages 189-195.
  • Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:5:id:3928-cjas
    DOI: 10.17221/3928-CJAS
    as

    Download full text from publisher

    File URL: http://cjas.agriculturejournals.cz/doi/10.17221/3928-CJAS.html
    Download Restriction: free of charge

    File URL: http://cjas.agriculturejournals.cz/doi/10.17221/3928-CJAS.pdf
    Download Restriction: free of charge

    File URL: https://libkey.io/10.17221/3928-CJAS?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. L. Čurda & J. Rudolfová, 2000. "Changes of iodine content in milk of cows treated with Betadine," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 18(1), pages 5-8.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. J. Travnicek & I. Herzig & J. Kursa & V. Kroupova & M. Navratilova, 2006. "Iodine content in raw milk," Veterinární medicína, Czech Academy of Agricultural Sciences, vol. 51(9), pages 448-453.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:caa:jnlcjs:v:51:y:2006:i:5:id:3928-cjas. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Ivo Andrle (email available below). General contact details of provider: https://www.cazv.cz/en/home/ .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.