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• W1655291285 abstract "Two experiments were conducted to evaluate oocyte collection rates and in vitro nuclear maturation rates of equine oocytes obtained during diestrus and pregnancy, and to compare these rates with maturation rates in oocytes derived from preovulatory follicles. In Experiment I, transvaginal ultrasound-guided aspiration of follicle was performed during estrus and diestrus in 14 mares over four consecutive cycles. Follicular aspirations during estrus were performed 24 to 27 hours after injection of 2500 IU of hCG given when the largest follicle reached 35 mm in diameter. Oocyte recovery rate from preovulatory follicles was 51% (33/65) in 49 aspiration sessions. Cumulus-oocyte complexes from preovulatory follicles were cultured for 12-15 hours in TCM199 + 10% (NCS) at 38.5°C in 5% CO2 in air, and 22/33 (67%) were in metaphase II. During diestrus, mares were treated (Group I) or not treated (Group II) daily with equine pituitary extract (EPE) during alternate cycles from days 1 to 14 after the preovulatory aspiration. Diestrous follicles were aspirated when four or more follicles greater than 12 mm in diameter were present. EPE had no effect on the number of follicles that developed during estrus or diestrus (p>0.05). Oocytes were recovered from 119 of 383 diestrous follicles (31 %)in 75 sessions. There was no difference in recovery rates between Groups I and II (p>0.05). Maturation rates for oocytes collected during diestrus, after 42 hours of culture in TCM 199 + 1 μg/ml of Estradiol and lnl/ml of EPE, were not significantly different (p>0.05) between Groups I and II (49% vs. 53%). In Experiment II, mares between 50 and 85 days of pregnancy were used as oocyte donors. The oocyte recovery rate was 53% (66/125). After in vitro maturation for 40 hours (compact COC) or 15 hours (expanded COC), 22% (7/32) and 22% (7/32), respectively, of the oocytes were in metaphase II. It was concluded that: 1) Preovulatory follicles yield a higher percentage of oocytes with a higher rate of maturation to metaphase II than follicles of diestrus and pregnant mares. 2) Diestrous follicles yielded fewer oocytes than follicles of pregnant mares but with a higher percentage of oocyte maturation. Further studies are necessary to determine if oocytes recovered from diestrous follicles and matured in vitro can be fertilized successfully." @default.
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• W1655291285 date "2001-01-01" @default.
• W1655291285 modified "2023-10-18" @default.
• W1655291285 title "Collection and in Vitro Maturation of Equine Oocytes from Estrus, Diestrus and Pregnant Mares" @default.
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• W1655291285 doi "https://doi.org/10.1016/s0737-0806(01)70235-3" @default.
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