Holzmann, V. M. M.; Trentin, M.; Rego, F. C. de A.; Cunha Filho, L. F. C.; Ludovico, A. Melatonin Concentration in the Milk of Cows Supplemented With Vitamins and Milked Twice Daily. Semina: Ciênc. Agrár. 2019, 40, 2017-2026.