132 BLASTOCYST DEVELOPMENT OF EQUINE OOCYTES WITH LOW MEIOTIC COMPETENCE HELD IN ROSCOVITINE BEFORE IN VITRO MATURATION

At the time of recovery, immature equine oocytes may be separated into those with either expanded cumuli (Ex) or compact cumuli (Cp). The Cp oocytes originate from viable follicles but are largely juvenile, with low meiotic competence (20 to 30% maturation to MII), and possibly reduced developmental competence. We previously found that in Cp oocytes recovered immediately after slaughter, suppression of meiosis with roscovitine for 24 h before maturation increased embryo development at 4 days after intracytoplasmic sperm injection (ICSI; Franz et al. 2003 Reproduction 125, 693–700). The present study was conducted to evaluate the effect of roscovitine suppression on nuclear maturation and blastocyst formation of Cp oocytes recovered after transport of ovaries from the abattoir (i.e. recovered 5–9 h after slaughter). Compact oocytes recovered from transported ovaries were cultured in M199 with 10% FBS containing 66 μM roscovitine with or without an oil cover. After 16–18 or 24 h, oocytes were fixed to examine the chromatin configuration. Treatment for 16–18 h without oil resulted in the lowest rate of meiotic resumption (0%); thus this treatment was utilized in further studies. Resumption in other treatments ranged from 3 to 6%. Following roscovitine suppression, oocytes were cultured for 30 h in M199 with 10% FBS and 5 μU mL−1 FSH for maturation; control oocytes were cultured for 30 h in the same medium immediately after recovery. Mature oocytes were subjected to ICSI, then cultured in DMEM/F-12 with 10% FBS with or without co-culture with equine oviductal epithelial cells under mineral oil in 5% CO2 in air at 38.2°C, and then evaluated at 7.5 days. Progression to MII (82/376, 22%) after maturation of roscovitine-treated oocytes was similar to that for control oocytes (74/395, 19%). There was no significant difference in cleavage rates after ICSI (72–78%) among treatments. Development to blastocyst was highest in roscovitine-treated oocytes in DMEM/F-12 with co-culture (11/30, 37%); this was significantly higher than that of non-treated oocytes in DMEM/F-12 alone (5/36, 14%), but similar to that of non-treated/DMEM/F-12/co-culture (10/37, 27%) and roscovitine/DMEM/F-12 alone (8/39, 21%). These data indicate that roscovitine induces a fully reversible meiotic suppression in Cp equine oocytes recovered 5–9 h after slaughter, and that this suppression does not harm subsequent developmental competence. This treatment may be used to manipulate the time of onset of maturation of equine oocytes for ease of subsequent procedures. Co-culture with oviductal epithelial cells tended to increase blastocyst rate (P = 0.1, Fisher's exact test) in contrast to our previous findings with embryos from Ex oocytes (Choi et al. 2004 Biol. Reprod. 70, 1231–1238). Further work is needed to determine whether this is related to differences in intrinsic developmental competence between oocyte types. This work was supported by the Link Equine Research Endowment Fund (Texas A&M University).