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• W3043886154 abstract "Letrozole is used for the treatment of subfertility in women undergoing ovarian superstimulation, but the mechanism of action has not been investigated critically. The objective was to test the hypothesis that treatment with letrozole will potentiate the superstimulatory response following gonadotropin treatment by increasing the number of follicles present at ovarian follicular wave emergence in cattle. In Experiment 1, ovarian follicular wave emergence was synchronized among beef heifers (n = 8) by transvaginal ultrasound-guided follicle ablation. On Day 0 (wave emergence), a letrozole-releasing device (LRD) was placed intravaginally for 5 days, followed again by transvaginal follicle ablation on Day 5. The number of follicles ≥3 mm was recorded by transrectal ultrasonography on Days 0 and 6.5 (i.e., pre- vs. post-LRD treatment). In Experiment 2, non-lactating dairy cows were assigned randomly to one of two groups (n = 15/gp) after follicle ablation-induced synchronization of wave emergence (Day 0), and given either an LRD or sham device for 5 days. Superstimulatory treatment was initiated on Day 0, consisting of 8 doses of 50 mg of porcine FSH im at 12 h intervals, and luteolytic doses of prostaglandin on Days 3 and 3.5. The LRD/sham devices were removed on Day 3.5, GnRH was given im on Day 5, estrus response was determined on Days 5 and 6, and the ovarian response was recorded by ultrasonography on Days 0, 3.5, 5, 6.5, and 12. In Experiment 1, no difference was detected in the number of antral follicles at wave emergence pre- vs. post-LRD treatment (23.2 ± 3.2 vs. 23.5 ± 3.8 follicles; P = 0.67; mean ± SEM). In Experiment 2, the interval from prostaglandin treatment to estrus was longer (50.3 ± 1.1 vs. 40.7 ± 2.0 h; P < 0.001) and less variable (residuals: 3.1 ± 0.5 vs. 6.7 ± 0.9 h; P < 0.01) in the LRD vs. sham group. The proportion of ovulations (number of CL on Day 12 over the number of follicles ≥3 mm on Day 0) did not differ (0.65 ± 0.02 vs. 0.70 ± 0.02; P = 0.15) nor did the number of CL on Day 12 (15.9 ± 2.5 vs. 19.0 ± 2.0; P = 0.32) between the LRD and sham groups. In summary, treatment with letrozole did not increase the number of antral follicles at wave emergence or the superstimulatory response, but increased precision in the interval to estrus and may be useful for artificial insemination at a fixed time in superstimulatory protocols." @default.
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• W3043886154 date "2020-11-01" @default.
• W3043886154 modified "2023-09-23" @default.
• W3043886154 title "An attempt to potentiate the ovarian superstimulatory response in cattle by co-treatment with an aromatase inhibitor" @default.
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• W3043886154 doi "https://doi.org/10.1016/j.theriogenology.2020.07.019" @default.
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