Figure 2From: Plasma Vitamin E and Blood Selenium Concentrations in Norwegian Dairy Cows: Regional Differences and Relations to Feeding and HealthRelation of plasma a-tocopherol (μg/ml) and blood selenium (μg/g) to days from last calving (DAYSPP) in Norwegian dairy cows in February. The least sum of squares lines (GLM model type III, with linear, quadratic and cubic terms of DAYSPP) with 95% confidence limits are indicated. n = 285 for α-tocopherol; 274 for selenium.Back to article page