Maluf, D.Z., Pires, A.V., Susin, I., Moreira, R.J. de C., Madureira, E.H., Binelli, M., Gonçalves, J.R., Lima, L.G. de, Mendes, C.Q. and Biehl, M.V. 2010. Evaluation of used progestagen implants on pregnancy rate in beef cows. Brazilian Journal of Veterinary Research and Animal Science. 47, 1 (Feb. 2010), 38-46. DOI:https://doi.org/10.11606/issn.1678-4456.bjvras.2010.26847.