“…Twelve (human: (Sheikhi et al, 2011;Khosravi et al, 2013;Fabbri et al, 2014;Klocke et al, 2014;Jafarabadi et al, 2015;Abir et al, 2016;Marschalek et al, 2021;); goat: (Carvalho et al, 2013;Faustino et al, 2015); bovine: (Shahsavari et al, 2019(Shahsavari et al, , 2020; ovine: (Silva et al, 2018)) observed no impairment of follicular morphology post-vitrification when compared to control. On the other hand, twenty-two studies (ovine: (Bandeira et al, 2015;Morais et al, 2019); goat: (Carvalho et al, 2014;Donfack et al, 2018Donfack et al, , 2019Montano Vizcarra et al, 2020); cat: (Brito et al, 2018); deer: (Gastal et al, 2018); human: (Gandolfi et al, 2006;Keros et al, 2009;Xiao et al, 2010Xiao et al, , 2017Mofarahe et al, 2015;Sanfilippo et al, 2015;Tian et al, 2015;Wang et al, 2016;Dalman et al, 2017;Barbato et al, 2018;Haino et al, 2018;Ramezani et al, 2018;Lee et al, 2019;Ramos et al, 2022) indicated that vitrification reduces the percentage of viable follicles compared to fresh follicles. Overall, there was heterogeneity (I 2 = 93%) between the studies evaluated, so a random effect model was used for the pooled estimates.…”