α-Tocopherol in plasma and milk from organically managed dairy cows fed natural or synthetic vitamin E or seaweed (original) (raw)

Steinshamn, Håvard; Luteberget, Ingvild Steinnes; Jensen, Søren K. and Thuen, Erling (2012) α-Tocopherol in plasma and milk from organically managed dairy cows fed natural or synthetic vitamin E or seaweed. In:Rahmann, Gerold and Godinho, Denise (Eds.)Tackling The Future Challenges of Organic Animal Husbandry, (German) Agriculture and Forestry Research, Braunschweig, Germany, Agriculture and Forestry Research, Special Issue No 362 , no. 362, pp. 450-453.

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Document available online at: http://www.vti.bund.de/en/startseite/vti-publications/landbauforschung-special-issues.html

Summary in the original language of the document

The objective was to compare the effects of supplementing lactating dairy cows with synthetic (All-rac), natural (RRR) α-tocopheryl acetate or seaweed with a control on the concentration of α-tocopherol in blood and milk. Twenty four dairy cows in mid lactation, fed an organic feed ration, were randomly allocated to the four treatments in a replicated Latin square design. Plasma and milk α-tocopherol concentrations were higher in RRR and All-rac than in the other treatments and higher in RRR than in All-rac. RRR-α-tocopherol was the predominant steroisomer (> 86%), in both plasma and milk, whereas the remaining part was largely made up by the three synthetic 2R isomers. In cows fed the control, seaweed and RRR, the proportion of RRR-α-tocopherol in plasma and milk constituted more than 97% of the total α-tocopherol. The study demonstrated that dairy cows in mid and late lactation have preferential uptake of RRR-α-tocopherol compared to other stereoisomers

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