Blood flow in the wall of the preovulatory follicle and its relationship to pregnancy establishment in heifers

Siddiqui, M.A.R.; Al-Mamun, Md.; Ginther, O.J.

doi:10.1016/j.anireprosci.2008.07.008

Cited by 66 publications

(50 citation statements)

References 15 publications

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“…The smaller preovulatory follicle at the time of GnRH treatment suggests that the ovulation-inducing treatment was given when the follicle was less developed. The association between greater follicular diameter and oocyte cleavage in the present study is in agreement with the previous reports of an association between greater follicular diameter and establishment of pregnancy in mares (Silva et al 2006) and heifers (Perry et al 2005, Siddiqui et al 2009b. Although follicular diameter was not considered in the hypothesis, greater diameter was positively related to greater oocyte recovery and cleavage but not to embryo development beyond 8 cells.…”

Section: Discussionsupporting

confidence: 82%

“…Mares that were negative for hCG antibodies had greater frequency of mature oocytes and greater vascularity of the follicular wall (Siddiqui et al 2009a). Colour Doppler assessment of blood flow in the follicular wall in mares (Silva et al 2006) and heifers (Siddiqui et al 2009b) indicated that follicular blood flow was greater in the animals that became pregnant after insemination.…”

Section: Introductionmentioning

confidence: 99%

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Relationship of vascular perfusion of the wall of the preovulatory follicle to in vitro fertilisation and embryo development in heifers

Siddiqui¹,

Gastal²,

Gastal³

et al. 2009

Reproduction

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The effect of the extent of vascular perfusion of the wall of the preovulatory follicle on in vitro cleavage rate of the recovered oocyte and embryo development to >8 cells was studied in 52 heifers. Heifers received a luteolytic dose of prostaglandin F2α (PGF2α) when the largest follicle was ≥11 mm. An ovulation-inducing injection of GnRH was given 36 h later (hour 0), and collection of follicular fluid and the oocyte was done at hour 26. Vascular perfusion of the follicular wall was assessed by colour Doppler ultrasonography at hours 0 and 26. Each of the recovered oocytes (41/52; 79%) was mature (extruded polar body). Cleavage and embryo development were assessed at 48 h and 120 h respectively, after in vitro fertilisation (IVF). The percentage of cleaved oocytes and >8 cell embryos was 80% (31/39) and 55% (17/31) respectively. Vascular perfusion of the follicular wall was greater (lower pulsatility index; P<0.001) for follicles that produced cleaved versus non-cleaved oocytes and greater (P<0.04) for follicles that produced >8 cell versus ≤8 cell embryos. Percentage of follicular wall with Doppler signals of blood flow was greater (P<0.001) for >8 cell versus ≤8 cell embryos. Follicular-fluid concentration of free IGF1 was lower for cleaved oocytes (P<0.001) and >8 cell embryos (P<0.05), and oestradiol was lower (P<0.05) for >8 cell embryos. Results supported the hypothesis that greater vascular perfusion of the wall of the preovulatory follicle was positively associated with IVF and embryo development.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Relationship of vascular perfusion of the wall of the preovulatory follicle to in vitro fertilisation and embryo development in heifers

Siddiqui¹,

Gastal²,

Gastal³

et al. 2009

Reproduction

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“…Early gestational diagnosis had aimed to improve herd production, since it could enable an early reintroduction of the non--pregnant cows in reproduction, and an increased number of pregnant animals in a shorter time. In addition, real time methods to predict fertility at the time of AI and ET procedure were also previously tested (Silva et al 2006, Siddiqui et al 2008, Sá Filho et al 2010a. Therefore, an immediate diagnosis to help the decision of using or discarding an animal from an AI or ET program is still questionable.…”

Section: Introductionmentioning

confidence: 99%

“…Follicle vascularity and its effects on fertility had been investigated in mares (Silva et al 2006) and cows (Shrestha et al 2006, Siddiqui et al 2008). Near ovulation, was shown that an extensive vascularity is formed in the follicular wall until the ovulation occurs (Geva & Jaffe 2000, Reisinger et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, since it is a non invasive technique and with reliable application, it is a useful tool to target new reproductive diagnoses. The evaluation of perifollicular vascularity was done in cows (Siddiqui et al 2008), women (Coulam et al 1999, Bhal et al 2001, Borini et al 2001, and mares (Silva et al 2006), and in all of these species was detected greater vascularity in the preovulatory follicle wall in individuals that became pregnant after mating.…”

Section: Introductionmentioning

confidence: 99%

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Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

et al. 2015

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Abstract:Two ultrasound based fertility prediction methods were tested prior to embryo transfer (ET) and artificial insemination (AI) in cattle. Female bovines were submitted to estrous synchronization prior to ET and AI. Animals were scanned immediately before ET and AI procedure to target follicle and corpus luteum (CL) size and vascularity. In addition, inseminated animals were also scanned eleven days after insemination to target CL size and vascularity. All data was compared with fertility by using gestational diagnosis 35 days after ovulation. Prior to ET, CL vascularity showed a positive correlation with fertility, and no pregnancy occurred in animals with less than 40% of CL vascularity. Prior to AI and also eleven days after AI, no relationship with fertility was seen in all parameters analyzed (follicle and CL size and vascularity), and contrary, cows with CL vascularity greater than 70% exhibit lower fertility. In inseminated animals, follicle size and vascularity was positive related with CL size and vascularity, as shown by the presence of greater CL size and vascularity originated from follicle with also greater size and vascularity. This is the first time that ultrasound based fertility prediction methods were tested prior to ET and AI and showed an application in ET, but not in AI programs. Further studies are needed including hormone profile evaluation to improve conclusion.

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Ovarian Follicular and Luteal Dynamics in Cattle

Adams

Singh

2014

Bovine Reproduction

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Blood flow in the wall of the preovulatory follicle and its relationship to pregnancy establishment in heifers

Cited by 66 publications

References 15 publications

Relationship of vascular perfusion of the wall of the preovulatory follicle to in vitro fertilisation and embryo development in heifers

Relationship of vascular perfusion of the wall of the preovulatory follicle to in vitro fertilisation and embryo development in heifers

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

Ovarian Follicular and Luteal Dynamics in Cattle

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