Zigo, František, Milan Vasiľ, Zuzana Farkašová, Martina Zigová, and Juraj Elečko. 2017. “Influence of Selenium and Vitamin E Supplementation During Pregnancy on Udder Health and Milk Quality in Dairy Cows at Parturition”. Potravinarstvo Slovak Journal of Food Sciences 11 (1):58-64. https://doi.org/10.5219/694.