Ferreira, A. de M., Viana, J. H. M., de Sá, W. F., Camargo, L. S. de A., & Verneque, R. da S. (2000). Low level of nutrition and ovarian luteal cyclic activity postpartum in crossbred (Holstein x Zebu) cows. Pesquisa Agropecuaria Brasileira, 35(12), 2521–2528. https://doi.org/10.1590/S1678-3921.pab2000.v35.6049