Abstract
The aim of this experiment was to apply an ovarian superstimulation protocol prior to ovum pick up (OPU), tailored to the individual donor response, to evaluate its advantages and disadvantages in terms of follicle numbers and diameters, the numbers of retrieved oocytes and day 7 cultured blastocysts. Ten adult non-lactating dairy cows were superstimulated with pFSH and subjected to ovum pick up-in vitro fertilisation (OPU-IVF) 6 times at 2-week intervals. On day 0 of each 2-week period, all follicles >8 mm were ablated and an ear implant (Crestar ®, Intervet, Belgium) was inserted. On day 2, 48 h after follicle ablation the animals were administered six equal doses of pFSH, divided into morning and evening doses for 3 days. On day 7, 48 h following the last pFSH injection, follicle diameters were measured by ultrasound and all follicles were subjected to OPU. All cumulus-oocyte complexes (COC), regardless of their quality, were subjected to in vitro maturation-in vitro fertilisation-in vitro culture (IVM-IVF-IVC). The total dose of pFSH prior to the first OPU session was 300 μg per animal. During the following OPU sessions, the total pFSH dose was either kept unchanged, increased or reduced (±50 μg), according to the percentage of follicles of more than 11 mm in diameter, present in the previous session of that particular donor. The mean number of punctured follicles per session was 11.9 ± 7.7 (mean ± S.D.), with 16% of follicles exceeding 11 mm. These follicles yielded a mean of 5.6 ± 4.1 cumulus oocyte complexes (COC), 32% of which had ≥3 layers of cumulus cells (quality 1 and 2). The recovery rate was 47%. Finally, all COC were subjected to IVM-IVF-IVC, which resulted in a mean of 2.0 ± 2.3 blastocysts on day 7 postinsemination. The subtle changes in pFSH dose influenced the sizes but not the numbers of follicles, the latter parameter was influenced by the individual donor and the OPU session.
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