1994
DOI: 10.1016/0093-691x(94)90113-w
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Ovarian synchronization following ultrasound-guided transvaginal follicle ablation in heifers

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Cited by 164 publications
(62 citation statements)
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References 28 publications
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“…In addition, our study demonstrates that pretreatment with OPU does not have an adverse effect on ovulation synchronicity by the PRID treatment and timed AI protocol in early postpartum suckled beef cows. Since OPU synchronizes follicular waves [15][16][17] and follicular aspiration can skip the follicular regression process to produce emergence of a new wave, OPU at PRID insertion could shorten the period of PRID placement in the vagina and result in better follicular growth synchronization. It is necessary to determine the appropriate length for the PRID placement period from one timed AI protocol to the next to attain a high conception rate because the l e n g t h i s c l o s e l y r e l a t e d t o g r o w t h a n d degeneration of the dominant follicle [17,20].…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…In addition, our study demonstrates that pretreatment with OPU does not have an adverse effect on ovulation synchronicity by the PRID treatment and timed AI protocol in early postpartum suckled beef cows. Since OPU synchronizes follicular waves [15][16][17] and follicular aspiration can skip the follicular regression process to produce emergence of a new wave, OPU at PRID insertion could shorten the period of PRID placement in the vagina and result in better follicular growth synchronization. It is necessary to determine the appropriate length for the PRID placement period from one timed AI protocol to the next to attain a high conception rate because the l e n g t h i s c l o s e l y r e l a t e d t o g r o w t h a n d degeneration of the dominant follicle [17,20].…”
Section: Discussionmentioning
confidence: 99%
“…Estradiol benzoate in PRIDs elevates plasma estradiol-17β (E 2 ) concentrations for two days after insertion, and this high E 2 environment helps in synchronization of follicular waves [14]. Follicular aspiration by ovum pick-up (OPU) before insertion of a PRID could omit the phase of follicular degeneration and synchronize the emergence of follicular waves without large individual variations [15][16][17]. This procedure would also be useful in collecting valuable embryos without prolonging the open period of the donor cow.…”
mentioning
confidence: 99%
“…Collection of the FF was done using UTFA as described by Bergfelt et al (28). Briefly, caudal epidural anesthesia was performed using 3 to 6 ml of a 2% lidocaine solution (Rotexmedicca, TrittauGermany).…”
Section: Collection Of the Follicular Fluidmentioning
confidence: 99%
“…Heifers were examined daily by transrectal ultrasonography to detect ovulation. Transvaginal ultrasoundguided follicular aspiration of follicles ≥5 mm was performed five to eight days after ovulation to synchronize wave emergence [145]. Heifers were examined daily by transrectal ultrasonography to detect follicular wave emergence, which was expected 1 to 1.5 days after follicular ablation [145].…”
Section: Treatments and Examinationsmentioning
confidence: 99%
“…Transvaginal ultrasoundguided follicular aspiration of follicles ≥5 mm was performed five to eight days after ovulation to synchronize wave emergence [145]. Heifers were examined daily by transrectal ultrasonography to detect follicular wave emergence, which was expected 1 to 1.5 days after follicular ablation [145]. Four days after follicular ablation (approximately 2.5 days after follicular wave emergence), and at the time follicular dominance becomes apparent [57], heifers were assigned randomly to the following treatment groups and given a single intravenous dose of 1) 500 µg/kg of letrozole (high dose group, n=9), 2) 250 µg/kg of letrozole (medium dose group, n=10), 3) 125 µg/kg of letrozole (low dose group, n=10), or 4) 20 ml of phosphate buffered saline (PBS control group, n=10).…”
Section: Treatments and Examinationsmentioning
confidence: 99%