Catto, J.B. and Afonso, E. (2001) “Natality rate of cows and development of calves submitted to early weaning in the Pantanal region, Brazil”, Pesquisa Agropecuaria Brasileira, 36(9), pp. 1205–1211. doi:10.1590/S1678-3921.pab2001.v36.6242.