Journal article
Short communication: Artificial ultraviolet B light exposure increases vitamin D levels in cow plasma and milk
Division of Food Chemistry, National Food Institute, Technical University of Denmark1
National Food Institute, Technical University of Denmark2
Aarhus University3
Department of Applied Mathematics and Computer Science, Technical University of Denmark4
Statistics and Data Analysis, Department of Applied Mathematics and Computer Science, Technical University of Denmark5
Scan Research A/S6
The number of dairy cows without access to pasture or sunlight is increasing; therefore, the content of vitamin D in dairy products is decreasing. Ultimately, declining vitamin D levels in dairy products will mean that dairy products are a negligible source of natural vitamin D for humans. We tested the ability of a specially designed UVB lamp to enhance the vitamin D-3 content in milk from dairy cows housed indoors.
This study included 16 cows divided into 4 groups. Each group was exposed daily to artificial UVB light simulating 1, 2, 3, or 4 h of summer sun at 56 degrees N for 24 d, and the group with simulated exposure to 2 h of summer sun daily continued to be monitored for 73 d. We found a significant increase in 25-hydroxyvitamin D-3 (25OHD(3)) levels in plasma as well as vitamin D-3 and 25OHD(3) levels in milk after daily exposure for 24 d in all treatment groups.
Extending daily exposure to artificial UVB light to 73 d did not lead to an increase of vitamin D-3 or 25OHD(3) level in the milk. In conclusion, the change in production facilities for dairy cows providing cows with no access to pasture and sunlight causes a decrease of vitamin D levels in dairy products.
This decrease may be prevented by exposing cows to artificial UVB light in the stable.
Language: | English |
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Year: | 2015 |
Pages: | 6492-6498 |
ISSN: | 15253198 and 00220302 |
Types: | Journal article |
DOI: | 10.3168/jds.2014-9277 |
ORCIDs: | Jakobsen, Jette |