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- W2017023141 abstract "Depriving the ovary of exogenous FSH for 1, 2 or 3 d following a bolus injection of FSH was shown to influence the quality of the recovered oocytes. Thus, we compared the developmental competence of oocytes from heifers which had been stimulated for 3 d with FSH (Folltropin-V) and, after an interval of 36, 48 or 60 h, underwent blind transvaginal aspiration. The ovaries of heifers with a palpable or functional corpus luteum were aspirated to remove all large follicles 2 d prior to being injected with either 6 doses of saline (S), 6 doses (20 mg/mL) of FSH (F), or in 6 decreasing doses of FSH (3, 3, 2, 2, 1, 1 mL; Fd). Follicles were counted and classified (medium: 5 to 10 mm, large: >10 mm) with ultrasonography before each aspiration. The oocytes recovered were classified, matured, fertilized, and developed in vitro. On a per animal basis, 1.5, 5.2 and 4.7 large and 1.5, 10.7 and 10.7 medium follicles were counted for S, F and Fd, respectively. A mean of 3.3, 9.1 and 7.7 oocytes was recovered for treatments S, F and Fd, respectively and 58, 94 and 82% were enclosed in a nonexpanded cumulus or a corona layer. Oocyte development rates were based on counts of embryos with 32 or more nuclei at Day 6.5. When oocytes were recovered 36 h after the last injection, an average of 1, 2.7 and 2 embryos per animal was obtained with S, F and Fd, respectively; at 48 h, 0.75, 4.25 and 1 embryo; and at 60 h, 0, 2.5 and 2.7 embryos. Variance analysis was performed, and the protected LSD test indicated that treatment F at 48 h resulted in a significantly higher embryo rate than Fd at 48 h (P<0.05) or S (all times; P<0.05). The reduced effect of the Fd regimen could be due to the decreasing FSH support during follicular growth or to the lower total amount of FSH given. In conclusion, these results indicate an advantage of using moderate (3 d) follicle stimulation followed by a period of FSH starvation to obtain optimal embryo production." @default.
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- W2017023141 title "The time interval between FSH administration and ovarian aspiration influences the development of cattle oocytes" @default.
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- W2017023141 doi "https://doi.org/10.1016/s0093-691x(99)00019-9" @default.
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