Î±-Tocopherol concentration and stereoisomer composition in plasma and milk from dairy cows fed natural or synthetic vitamin E around calving

Guillermo Meglia; SÃ¸ren K. Jensen; Charlotte Lauridsen; Karin Persson Waller

Î±-Tocopherol concentration and stereoisomer composition in plasma and milk from dairy cows fed natural or synthetic vitamin E around calving

In: Mastitis in dairy production

Authors:

Guillermo Meglia

Guillermo Meglia ¹Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden

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SÃ¸ren K. Jensen

SÃ¸ren K. Jensen ²Department of Animal Health, Welfare and Nutrition, Danish Institute of Agricultural Sciences, Tjele, Denmark

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Charlotte Lauridsen

Charlotte Lauridsen ²Department of Animal Health, Welfare and Nutrition, Danish Institute of Agricultural Sciences, Tjele, Denmark

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Karin Persson Waller

Karin Persson Waller ¹Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
³Department of Pigs, Poultry and Ruminants, National Veterinary Institute, Uppsala, Sweden

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Type:: Chapter

Pages:: 166â171

DOI:: https://doi.org/10.3920/9789086865505_021

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Vitamin E is an important antioxidant with positive effects on immune functions of dairy cows. A lowered blood concentration around calving has been associated with immune suppression, and increased disease incidence. Studies on supplementation of vitamin E in the periparturient period have exclusively been performed with synthetic vitamin E, but the natural form, RRR-Î±-tocopherol, has been shown to have a higher biological activity than the synthetic forms in several species. The aim of this study was to compare the effects of supplementing dairy cows with 1000 IU/day of all-rac-Î±-tocopheryl acetate (SynAc), RRR- Î±-tocopheryl acetate (NatAc), or RRR-Î±-tocopherol (NatAlc), from 3 weeks before to 2 weeks after calving, on the concentration of Î±-tocopherol and its stereoisomers in blood and milk. An unsupplemented group was also included (control). Blood samples were collected at 3, 2 and 1 weeks before calving, at calving, and 3, 7 and 14 days after calving, while milk samples were taken twice within 24 h after calving and at 7 and 14 days in milk. The plasma concentration of Î±-tocopherol was significantly higher in NatAc than in the other groups. A significant effect of time was observed with lowest values around calving. The Î±- tocopherol concentration was significantly higher in colostrum than in milk. In control cows and cows supplemented with natural vitamin E, the proportion of RRR-Î±-tocopherol was higher than 98% in plasma and milk. In cows fed SynAc, the proportion of RRRstereoisomer in plasma and milk was significantly lower. In conclusion, daily oral supplementation of dairy cows with RRR-Î±-tocopheryl acetate gave the highest blood concentrations of Î±-tocopherol in the periparturient period. The Î±-tocopherol stereoisomer distribution further indicates that the conversion factor between all-rac- and RRR-Î±-tocopheryl acetate is higher in cows than the official ratio of 1.36 determined in rats.

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Mastitis in dairy production

Current knowledge and future solutions

E-Book ISBN:: 9789086865505

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

Subjects
- Life Sciences

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Î±-Tocopherol concentration and stereoisomer composition in plasma and milk from dairy cows fed natural or synthetic vitamin E around calving

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Mastitis in dairy production

Current knowledge and future solutions

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