Lima, F. A., Veras, M. B., Sales, J. N. de S., Crepaldi, G. A., Maio, J. R. G. de and Baruselli, P. S. (2010) “Reduction of first GnRH dosage in high-yielding holstein cows synchronized with Ovsynch or Heatsynch”, Brazilian Journal of Veterinary Research and Animal Science, 47(2), pp. 125-131. doi: 10.11606/issn.1678-4456.bjvras.2010.26836.