Ovarian Follicular and Luteal Dynamics in Cattle

Adams, Gregg P.; Singh, Jaswant

doi:10.1002/9781118833971.ch24

Cited by 8 publications

(8 citation statements)

References 169 publications

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“…Superovulatory strategies should aim to stimulate follicular growth or inhibit follicular atresia in order to trigger multiple ovulations from the available supply of ovarian follicles in donor cows. In this context, hormonal or physical treatments have been employed with the main goal of increasing the follicles potentially responsive to superovulation, stimulating their growth from the pool of the ovarian follicular reserves (i.e., reducing the inhibiting action of the dominant versus subordinate follicles) [2].…”

Section: Introductionmentioning

confidence: 99%

“…In the cow, the development of small follicles depends on the high circulating concentrations of follicle stimulating hormone (FSH). With the FSH level declining during the first three days of the follicular wave, most of the follicles stop growing and begin to regress within two to five days of emergence [1,2]. Despite this decline in FSH, the dominant follicle continues to grow, maintaining cellular proliferation and estradiol production [2].…”

Section: Introductionmentioning

confidence: 99%

“…With the FSH level declining during the first three days of the follicular wave, most of the follicles stop growing and begin to regress within two to five days of emergence [1,2]. Despite this decline in FSH, the dominant follicle continues to grow, maintaining cellular proliferation and estradiol production [2]. The developmental dynamic of follicles larger than 1 mm is well characterized but that of the smaller follicles remains unknown.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Embryo Recovery in Holstein Cows Treated by Intra-Ovarian Platelet Rich Plasma before Superovulation

Crémonesi

Bonfanti

Idda

et al. 2020

Veterinary Sciences

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The current research was designed to evaluate if intra-ovarian administration of autologous platelet rich plasma (PRP) before superovulation could increase the number of follicles responsive to gonadotropin treatment in order to improve embryo recovery in donor cows. Eight Holstein-Friesian cows of proven fertility were employed. After estrous synchronization, at the 18th day of diestrous, the right ovary of each cow was left untreated and served as control while the left ovary was inoculated with 5 mL of PRP. Cows were left to spontaneously return to estrous, and nine days later, a standard superovulation was initiated for every cow. Seven days after artificial insemination (AI), putative embryos were collected by flushing the right and left uterine horns separately. All statistics were calculated by ANOVA. The mean number of follicles, evaluated by transrectal ultrasound scanning, did not statistically differ before PRP treatment between right (control) and left (treated) ovaries (9.18 ± 1.35 and 7.32 ± 1.67, p = 0.28, respectively) as well as at 48 h after PRP injection (7.67 ± 2.52 and 8.00 ± 2.00, p = 0.73, respectively). A statistical (p = 0.023) difference was found in the average number of follicles at the last gonadotropin injection between control and treated ovaries (11.33 ± 2.89 and 20.00 ± 9.17, respectively). The statistically different (p = 0.0037) number of grade 1-2 blastocysts harvested from the uterine horn ipsilateral to control ovaries in comparison to that collected from the treated ones (6.63 ± 2.92 and 14.75 ± 5.92, respectively) suggests that intra-ovarian injection of PRP before superovulation could exert beneficial effects both in latent follicle growth and in vivo embryo production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of Embryo Recovery in Holstein Cows Treated by Intra-Ovarian Platelet Rich Plasma before Superovulation

Crémonesi

Bonfanti

Idda

et al. 2020

Veterinary Sciences

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“…Above-mentioned findings suggest that oocytes undergo maturational changes as the follicle grows. The transcriptional activity of the oocyte is reduced to a minimum by the time a follicle reaches 3 mm in diameter (Fair et al, 1995, 1996), i.e., the follicle stage at the beginning of a follicular wave [ 7 , 8 ]. Therefore, oocyte processes most likely influenced during follicular selection and dominance are cytoplasmic events such as changes to metabolic pathways, organelle structure and function, and their interactions with each other.…”

Section: Introductionmentioning

confidence: 99%

Organelle reorganization in bovine oocytes during dominant follicle growth and regression

Dadarwal

Adams

Hyttel

et al. 2015

Reprod Biol Endocrinol

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BackgroundWe tested the hypothesis that organelles in bovine oocytes undergo changes in number and spatial distribution in a manner specific for phase of follicle development.MethodsCumulus-oocyte-complexes were collected from Hereford heifers by ultrasound-guided follicle aspiration from dominant follicles in the growing phase (n = 5; Day 0 = ovulation), static phase (n = 5), regressing phase (n = 7) of Wave 1 and from preovulatory follicles (n = 5). Oocytes were processed and transmission electron micrographs of ooplasm representing peripheral, perinuclear and central regions were evaluated using standard stereological methods.ResultsThe number of mitochondria and volume occupied by lipid droplets was higher (P < 0.03) in oocytes from regressing follicles (193.0 ± 10.4/1000 μm3 and 3.5 ± 0.7 %) than growing and preovulatory stages (118.7 ± 14.4/1000 μm3 and 1.1 ± 0.3 %; 150.5 ± 28.7/1000 μm3 and 1.6 ± 0.2 %, respectively). Oocytes from growing, static and preovulatory follicles had >70 % mitochondria in the peripheral regions whereas oocytes from regressing follicles had an even distribution. Oocytes from growing follicles had more lipid droplets in peripheral region than in central region (86.9 vs. 13.1 %). Percent surface area of mitochondria in contact with lipid droplets increased from growing (2.3 %) to static, regressing or preovulatory follicle stage (8.9, 6.1 and 6.2 %). The amount, size and distribution of other organelles did not differ among phases (P > 0.11).ConclusionsOur hypothesis was supported in that mitochondrial number increased and translocation occurred from a peripheral to an even distribution as follicles entered the regressing phase. In addition, lipid droplets underwent spatial reorganization from a peripheral to an even distribution during the growing phase and mitochondria-lipid contact area increased with follicle maturation.

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“…Embryo production via techniques involving in vivo and in vitro fertilization is necessary to deploy a genome biobank and has been used to a limited extent in the preservation of some endangered wildlife species (Comizzoli, Mermillod, & Mauget, ; Loskutoff, Bartel, Meintjes, Godke, & Schiewe, ). Beginning with the bovine model (Adams & Singh, ), we have conducted a series of studies in an effort to develop these reproductive technologies for use in bison (Cervantes, Palomino, Anzar, Mapletoft, & Adams, ; Cervantes et al, , ; Palomino, Cervantes, & Adams, ; Palomino, McCorkell, Woodbury, & Adams, ; Palomino et al, , ; Toosi et al, ). An added complexity with North American bison is seasonality.…”

Section: Introductionmentioning

confidence: 99%

Effect of season and superstimulatory treatment on in vivo and in vitro embryo production in wood bison (Bison bison athabascae)

Palomino

Mastromonaco

Cervantes

et al. 2019

Reprod Domestic Animals

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Two experiments were done using a two-by-two design to determine the effects of season and superstimulatory protocol on embryo production in wood bison. In Experiment 1 (in vivo-derived embryos), ovarian superstimulation was induced in female bison during the ovulatory and anovulatory seasons with either two or three doses of FSH given every-other-day (FSH × 2 vs. FSH × 3, respectively). Bison were given hCG to induce ovulation, inseminated 12 and 24 hr after hCG, and embryos were collected 8 days after hCG (n = 10 bison/group). In Experiment 2 (in vitro embryo production), ovarian superstimulation was induced in female bison during the ovulatory and anovulatory seasons with two doses of FSH, and in vivo maturation of the cumulus-oocyte complexes (COC) was induced with hCG at either 48 or 72 hr after the last dose of FSH. COC were collected 34 hr after hCG, and expanded COC were used for in vitro fertilization and culture. In Experiment 1, the number of follicles ≥9 mm, the proportion of follicles that ovulated, the number of CL, and the total number of ova/embryos collected did not differ between seasons or treatment groups, but the number of transferable embryos was greater (p < .05) in the ovulatory season. In Experiment 2, no differences were detected between seasons or treatment groups for any end point. The number of transferable embryos produced per bison was greatest (p < .05) using in vitro fertilization and was unaffected by season (1.5 ± 0.2 and 1.1 ± 0.3 during anovulatory and ovulatory seasons, respectively), in contrast to in vivo embryo production which was affected by season (0.1 ± 0.01 and 0.7 ± 0.2 during anovulatory and ovulatory seasons, respectively). Results demonstrate that transferable embryos can be produced throughout the year in wood bison by both in vivo and in vitro techniques, but the efficiency of embryo production of in vivo-derived embryos is significantly lower during the anovulatory season. K E Y W O R D S FSH, in vitro embryo, in vivo embryo, season, wood bison | 55 PALOMINO et AL. How to cite this article: Palomino JM, Mastromonaco GF, Cervantes MP, Mapletoft RJ, Anzar M, Adams GP. Effect of season and superstimulatory treatment on in vivo and in vitro embryo production in wood bison (Bison bison athabascae).

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Ovarian Follicular and Luteal Dynamics in Cattle

Cited by 8 publications

References 169 publications

Improvement of Embryo Recovery in Holstein Cows Treated by Intra-Ovarian Platelet Rich Plasma before Superovulation

Improvement of Embryo Recovery in Holstein Cows Treated by Intra-Ovarian Platelet Rich Plasma before Superovulation

Organelle reorganization in bovine oocytes during dominant follicle growth and regression

Effect of season and superstimulatory treatment on in vivo and in vitro embryo production in wood bison (Bison bison athabascae)

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