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Synthetic vitamin supplementation is not consistent with organic production, so it is important to investigate whether dairy cows can maintain their health and production without synthetic vitamins being added to their diet. In basic dairy cow diets, provitamin A (β-carotene) and vitamin E are mainly found in pasture and in grass and legume silages, but the concentrations are highly variable. This...
This study investigated effects of daily supplementation with RRR-α-tocopheryl acetate, during the transition period around calving, on concentrations of α-tocopherol in plasma and milk from prepartum to mid-late lactation of dairy cows. Retinol and β-carotene contents also were measured. The study included 2 experiments, where all cows were fed 100% organic diets, with high proportions of grass-legume...
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