Alfa-tocopherol and beta-carotene in roughages and milk in organic dairy herds
2012
Mogensen, Lisbeth | Kristensen, Troels | Søegaard, Karen | Jensen, Søren K. | Sehested, Jakob
The aim of the present on-farm study was to analyse vitamin content in roughage at harvest and during storage and to analyze milk vitamin content when feeding the roughage to dairy cows. Roughages produced at five organic dairy farms were monitored at harvest and several times during winter as stored silage. As an average of several sampling times, roughage α-tocopherol and β-carotene contents (mg per kg DM) during the period when the roughage was fed were, respectively, 30 and 21 in grass–clover silage, 13 and 8 in maize wholecrop silage and 28 and 9 in cereal wholecrop silage. Daily intake of α-tocopherol was 876mg per cow–431mg from roughages, 89mg from concentrates and 356mg from a vitamin supplement. Milk yield was 25.9kg energy-corrected milk (ECM) per cow per day with α-tocopherol and β-carotene contents (μg/ml) of 0.82 and 0.17. The study additionally showed the following tendency, but due to few observations no final conclusions could be drawn.
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