Figure 3From: Prediction of Vitamin A, Vitamin E, Selenium and Zinc Status of Periparturient Dairy Cows Using Blood Sampling During the Mid Dry PeriodThe concentration of plasma selenium (mg/l) in blood samples taken from 20 dairy cows at 5 different time points relative to calving. The cows were fed low (■), medium (▲) or high (◆) amounts during the dry period. Values considered marginal or deficient (MD), and adequate (A) are indicated in the figure with horizontal lines.Back to article page