“…Among the pharmacological inducers, one of the most used has been calcium ionophore (A23187), not only in laboratory animals such as the guinea pig (Yanagimachi, 1975;Green, 1978) but also in bovine (Byrd, 1981;Beorlegui et al, 1997;Pereira et al, 2000), caprine (Pereira et al, 2000), equine (Cheng et al, 1996;Spizziri et al, 2010) and humans (Liu and Gordon Baker, 1998;Cardona-Maya et al, 2006). Among the physiological inducers of the AR, incubation with follicular fluid has been the most used in different species (golden hám-ster: Yanagimachi, 1969;mouse: Iwamatsu and Chang, 1969;equine: Cheng et al, 1998).…”