Pizelli, G. N.; Araújo, P. G.; Carvalho, M. R. de; Resende, O. de A.; Carvalho, L. F. de. Effect of Estrogen on Fertility of Apparently Normal Cows. PAB 2014, 8 (6), 9-11. https://doi.org/10.1590/S1678-3921.pab1973.v8.17332.