Abstract
Abstract Levels of folate-binding protein (FBP) (total and apo-form) were determined by an optical biosensor method, in individual milk samples from 41 Swedish Red and White and 25 Swedish Friesian dairy cattle. To evaluate the influence of lactation stage on FBP levels, milk samples were also taken from 5 cows at 1, 3, 10, 30, 60 and 90 days post partum. There was considerable variation between cows in levels of total FBP (2.9–11.1 μg mL−1), whereas the ratio between total FBP and its apo-form was relatively constant. Lactation stage markedly influenced levels of FBP, i.e. increased levels (22.9–43.9 μg mL−1) at the beginning of lactation, but average levels (≈5 μg mL−1) at 30 days of lactation. No differences were found between the two investigated dairy breeds.
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