The aim of this study was to test the effect of insulin-transferrin-selenium (ITS) and L-ascorbic acid (AA) supplementation and the hormonal level during in vitro maturation (IVM) of small oocytes from pre-pubertal goat on the blastocyst yield and quality. Concretely, we used four maturation media: conventional IVM medium (CM), growth medium (GM: CM+ITS+AA and low level of hormones), modified CM (mCM: CM with low level of hormones) and modified GM (mGM: CM+ITS+AA and normal level of hormones). Cumulus-oocyte complexes (COCs) were classified into two categories according to oocyte diameter: <125μm and ≥125μm. Large oocytes were matured 24h in CM (Treatment A). Small oocytes were matured randomly in six experimental groups: Treatment B: 24h in CM; Treatment C: 12h in GM and 12h in CM; Treatment D: 24h in mGM; Treatment E: 12h in mGM and 12h in CM; Treatment F: 12h in mCM and 12h in CM; and Treatment G: 12h in GM and 12h in mGM. After IVM, oocytes were fertilized and cultured for 8days. The blastocyst quality was assessed by the survival following vitrification/warming and the mean cell number. When different maturation media were combined, the blastocyst rate did not improve. The large oocytes produced the highest blastocysts yield. However, the culture of small oocytes in GM (53.3%) enhanced the post-warming survival of blastocysts compared to large oocytes matured in CM (35.7%). In conclusion, IVM of pre-pubertal goat small oocytes in GM would be useful to improve the quality of in vitro-produced blastocysts. © 2012 Blackwell Verlag GmbH.