Štenclová, Hana, Filip Karásek, Ondrej Šťastní­k, Ladislav Zeman, Eva Mrkvicová, and Leoš Pavlata. 2016. “The Effect of Reduced Zinc Levels on Performance Parameters of Broiler Chickens”. Potravinarstvo Slovak Journal of Food Sciences 10 (1):272-75. https://doi.org/10.5219/580.