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- W2150019785 abstract "Contents The aim of this retrospective study was to compare the number of follicles, cumulus oocyte complexes (COCs) and cultured In Vitro Produced (IVP) embryos obtained from 1396 non‐stimulated Ovum Pick‐up (OPU) sessions on 81 donor animals in a twice weekly OPU scheme. Results were obtained from 640 sessions following FSH‐LH superstimulation, on 112 donors subjected to OPU once every 2 weeks. The stimulation protocol started with the insertion of an ear implant containing 3 mg norgestomet (Crestar, Intervet, Belgium) 8 days before puncture (day −8). The dominant follicle was ablated by ultrasound‐guided follicle puncture on day −6. On day −3 and day −2, cows were injected with FSH (Ovagen, ICP) twice daily (8 am to 8 pm ), i.e. a total dose of 160 μ g FSH and 40 μ g LG per donor per stimulation cycle. Animals were punctured 48 h after the last FSH injection (day 0). Progesterone implants were removed the next day. Stimulated donor cows were treated with this protocol at 14‐day intervals. Follicles were visualized with a Dynamic Imaging ultrasound scanner, equipped with a 6.5 MHz sectorial probe. Follicles were punctured with 55 cm long, 18 gauge needles at an aspiration pressure corresponding to a flow rate of 15 ml/min. Cumulus oocyte complexes were recovered and processed in a routine IVF set‐up. Results demonstrate that, expressed per session, FSH stimulation prior to OPU increases production efficiency with significantly more follicles punctured and oocytes retrieved. However, when overall results during comparable 2‐week periods are considered (four non‐stimulated sessions vs one stimulated), more follicles are punctured and more oocytes are retrieved using the non‐stimulated protocol. No significant differences in the number of cultured embryos could be detected, indicating that FSH/LH stimulation prior to OPU might have a positive effect on in vitro oocyte developmental competence as more embryos are cultured with less, presumably better‐quality, oocytes." @default.
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- W2150019785 date "2008-03-06" @default.
- W2150019785 modified "2023-10-18" @default.
- W2150019785 title "Effects of Ovum Pick-up Frequency and FSH Stimulation: A Retrospective Study on Seven Years of Beef Cattle In Vitro Embryo Production" @default.
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- W2150019785 doi "https://doi.org/10.1111/j.1439-0531.2007.00873.x" @default.
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