Ferraz, J.B.S. and Duarte, F.A. de M. 1991. Selection indexes applied to productivity in Large White sows. Pesquisa Agropecuaria Brasileira. 26, 10 (Oct. 1991), 1777–1786. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3525.