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Iodine concentration in milk sampled from Canadian farms
S I Borucki Castro1, R Berthiaume, P Laffey
1Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada.
Journal of Food Protection
|September 11, 2010
Summary
Canadian milk iodine levels vary significantly, influenced by farm management. Component feeding and dip-cup teat cleaning practices are linked to lower iodine concentrations in milk.
Area of Science:
- Dairy Science
- Food Chemistry
- Agricultural Management
Background:
- Iodine is an essential nutrient for human and animal health.
- Milk is a significant source of dietary iodine for consumers.
- Understanding factors influencing milk iodine concentration is crucial for food safety and nutrition.
Purpose of the Study:
- To determine the iodine concentration in Canadian milk.
- To investigate the relationship between milk iodine levels and farm management practices, including feeding and milking procedures.
Main Methods:
- Milk samples were collected from 501 Canadian farms.
- Total iodine concentration was measured using inductively coupled plasma mass spectrometry.
- Farm management data were gathered via questionnaires and analyzed using a general linear model.
Main Results:
- Mean iodine concentration in Canadian milk was 304 ± 8.4 μg/kg, with wide variation (54–1,902 μg/kg).
- Component feeding was associated with lower milk iodine compared to total mixed rations.
- Teat washing/dipping methods influenced iodine levels, with spray applications showing higher concentrations than dip-cup procedures.
Conclusions:
- Canadian milk iodine concentration exhibits considerable variability.
- Feeding strategies, specifically component feeding versus total mixed rations, impact milk iodine levels.
- Milking hygiene practices, particularly teat sanitizer application methods, significantly influence milk iodine content.
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