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- W2162282260 abstract "This study was to investigate whether removing the dominant follicle 48 h before superstimulation influences follicular growth, ovulation embryo production in Holstein cows. After synchronization, ovaries were scanned to asses the presence of a dominant follicle by ultrasonography with a real-time linear scanning ultrasound system on Days 4, 6 and 8 of the estrus cycle (Day 0 = day of estrus). Twenty-six Holstein cows with a dominant follicle were divided into 2 groups in which the dominant follicle was either removed (DFR group, n=13) by ultrasound-guided follicular aspiration or left intact (control group, n=13) on Day 8 of the estrus cycle. Superovulation treatment was initiated on Day 10. All donors were superovulated with injections of porcine FSH (Folltropin™) twice daily with constant doses (total: 4000 mg) over 4 d. On the 6th and 7th injections of Folltropin, 30 mg and 15 mg of PGF2α (Lutalyse) were given. Donors were inseminated twice at 12 h and 24 h after the onset of estrus. Embryos were recovered on Day 6 or 7 after AI. During superstimulation, the number of follicles 2 to 5 mm (small), 6 to 9 mm (medium) and ≥ 10 mm (large) was determined by ultrasonography on a daily basis. At embryo recovery, the number of corpora lutea (CL) was also determined by ultrasonography and blood samples were collected for analysis of progesterone concentration. Follicular growth during superstimulation was earlier in the DFR group than in the control group. The number of medium and large follicles was greater (P < 0.01) in the DFR group than in the control group on Days 1 to 2 and Days 3 to 4 of superstimulation, respectively. The numbers of CL (9.6 ± 1.1 vs 6.1 ± 0.9) and progesterone concentration (30.9 ± 5.4 vs 18.6±3.5 ng/mL) were greater (P < 0.05) in the DFR group than in the control group, respectively. The numbers of total ova (7.7 ±1.3 vs 3.9 ±1.0) and transferable embryos (4.6 ± 0.9 vs 2.3 ± 0.8) were also greater (P < 0.05) in the DFR group than in the control group, respectively. It is concluded that the removal of the dominant follicle 48 h before superstimulation promoted follicular growth, and increased ovulation and embryo production in Holstein cows." @default.
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- W2162282260 date "2001-03-01" @default.
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- W2162282260 title "Effect of dominant follicle removal before superstimulation of follicular growth, ovulation and embryo production in Holstein cows" @default.
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- W2162282260 doi "https://doi.org/10.1016/s0093-691x(01)00455-1" @default.
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