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The capacity of fully grown oocytes to regulate their own microenvironment by paracrine factors secreted by the oocyte (oocyte-secreted factors, OSFs) may in turn contribute to oocyte developmental competence. Here, we investigated if OSFs have a direct influence on oocyte developmental competence during in vitro maturation (IVM). Bovine cumulus–oocyte complexes (COCs) were aspirated from abattoir-derived ovaries and matured in serum-free medium. COCs were either co-cultured with denuded oocytes (DOs) or treated with specific OSFs: recombinant bone morphogenetic protein 15 (BMP15) and/or growth differentiation factor 9 (GDF9). Following maturation, embryos were fertilized and cultured in vitro and blastocyst development and cell number were assessed on day 8. Co-culturing intact COCs with DOs did not affect cleavage rate, but increased (P<0.001) the proportion of cleaved embryos that …