Ulloa Ulloa C M, Yoshizawa M, Komoriya E, Mitsui A, Nagai T, Kikuchi K. The blastocyst production rate and incidence of chromosomal abnormalities by developmental stage in in vitro produced porcine embryos. J. Reprod. Dev. 54: 22-29, 2008. J. Reprod. Dev. 2008. 54. 1. 22-29