de Carvalho, P.R. et al. 2010. Manganese Deficiency in Bovines: Connection Between Manganese Metalloenzyme Dependent in Gestation and Congenital Defects in Newborn Calves. Pakistan Journal of Nutrition. 9, 5 (Apr. 2010), 488–503. DOI:https://doi.org/10.3923/pjn.2010.488.503.