Effect of eCG on early resumption of ovarian activity in postpartum dairy cows

Rostami, Behnam; Niasari-Naslaji, Amir; Vojgani, M.; Nikjou, D.; Amanlou, H.; Gerami, A.

doi:10.1016/j.anireprosci.2011.09.006

Cited by 31 publications

(35 citation statements)

References 42 publications

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“…However, reduction in the diameter of the ovulating follicle may be accompanied by progesteronaemia (Sartori and Barros 2011). An increase in the LH effect resulting from the injection of eCG (Sheldon and Dobson 2000;Rostami et al 2011) induces the ovulation of follicles with a smaller diameter (Perry et al 2005). This possibility explains the fact that, in our study, the increase in eCG dose is accompanied by an increase in the percentage of ovulations.…”

Section: Discussionsupporting

confidence: 60%

Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N’Dama cattle

Okouyi

Drion

Hanzen

2015

Trop Anim Health Prod

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The aim of this study was to assess the dose (300 to 600 IU) effects of equine chorionic gonadotropin (eCG) on the preovulatory follicle diameter, growth rate and time of ovulation characterized by echography. The eCG was injected at the end (D 0 ) of the 7-day treatment with a controlled internal device release (CIDR®) and a PGF 2α being injected 2 days before the removal of the CIDR® (d −2 ). The 120 N'Dama female were distributed into five experimental groups. The control group (n=26) was treated with physiological saline at the removal of the CIDR®, while the animals in the four treated groups received, respectively, 300 IU (n=25), 400 IU (n=24), 500 IU (n=22) and 600 IU (n=23) of eCG. The diameter of the preovulatory follicle was significantly higher (P<0.05) in the animals treated with 300 IU (10.1±1.4 mm) than in untreated animals (9.3±1.2 mm). Follicle growth rate was significantly (P<0.05) higher in treated animals (1.0± 0.4 mm/day) than in the control group (0.9±0.4 mm/day). The average interval between the time of eCG injection and ovulation was similar in the non-treated (83.7±14.4 h) and treated animals (79.7±11.9). Treated animals showed a significant increase in the percentage of ovulation (94.7 % compared to 73.1 %) (P<0.01). Use of eCG contributed towards synchronising the time of ovulation between 72 to 96 h, which would facilitate the use of systematic insemination.

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Section: Discussionsupporting

confidence: 60%

Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N’Dama cattle

Okouyi

Drion

Hanzen

2015

Trop Anim Health Prod

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“…Among these 3 used supplements, PMSG is known to act like FSH and LH and to enhance follicular growth. 26 According to Cannon et al, 27 PMSG induces follicular growth by stimulating the proliferation and differentiation of granulosa cells that reach a peak in the S phase 24 to 30 hours post-PMSG administration. The BMP4 is known as a promoter of follicular development acting not entirely only on the promotion of the primordial-primary follicle transition, 16 but also promoting granulosa cell proliferation that may increase the secretion of AMH by growing follicles and subsequently inhibit primordial follicle recruitment.…”

Section: Discussionmentioning

confidence: 99%

Short-Term Culture of Ovarian Cortical Strips From Capuchin Monkeys (Sapajus apella): A Morphological, Viability, and Molecular Study of Preantral Follicular Development In Vitro

et al. 2013

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The aim of this study was to evaluate whether an in vitro culture (IVC) medium containing either or not b-mercaptoethanol (BME), bone morphogenetic protein 4 (BMP4), or pregnant mare serum gonadotrophin (PMSG) could be able to promote the development of capuchin monkeys' preantral follicles enclosed in ovarian cortical strips. Follicular viability after IVC was similar to control (89.32%). Primordial follicle recruitment to primary stage was not reached with IVC, but the rate of secondary follicle formation was increased in the medium supplemented with BME, BMP4, and PMSG (44.86%) when compared to IVC control (9.20%). In the medium supplemented with BME, BMP4, and PMSG, contrary to other media, anti-müllerian hormone-messenger RNA (mRNA) expression in ovarian tissue was upregulated (3.4-fold), while that of growth differentiation factor-9 was maintained. The BMP4-mRNA expression, however, appeared downregulated in all cultured tissues. Our findings show a favorable effect of BME, BMP4, and PMSG on the in vitro development of secondary follicles from capuchin monkeys.

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“…A recent paper reports that eCG treatment on Day 6 post‐partum could assist the early resumption of ovarian activity by enhancing ovarian follicle growth and early ovulation (Rostami et al. ).…”

Section: Underlying Ovarian Follicular Responses To Ecg Treatmentmentioning

confidence: 99%

“…) especially in early post‐partum cows (Rostami et al. ), in cows with a low body condition score (BCS) (Souza et al. ) and in cows suffering long anoestrus or are under seasonal heat stress (Garcia‐Ispierto et al.…”

Section: Underlying Ovarian Follicular Responses To Ecg Treatmentmentioning

confidence: 99%

Use of Equine Chorionic Gonadotropin to Control Reproduction of the Dairy Cow: A Review

Rensis

López‐Gatius

2014

Reprod Domestic Animals

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Equine chorionic gonadotropin (eCG) is a member of the glycoprotein family of hormones along with LH, FSH and thyroid-stimulating hormone. In non-equid species, eCG shows high LH- and FSH-like activities and has a high affinity for both FSH and LH receptors in the ovaries. On the granulosa and thecal cells of the follicle, eCG has long-lasting LH- and FSH-like effects that stimulate oestradiol and progesterone secretion. Thus, eCG administration in dairy cattle results in fewer atretic follicles, the recruitment of more small follicles showing an elevated growth rate, the sustained growth of medium and large follicles and improved development of the dominant and pre-ovulatory follicle. In consequence, the quality of the ensuing CL is improved, and thereby progesterone secretion increased. Based on these characteristics, eCG treatment is utilized in veterinary medicine to control the reproductive activity of the cow by i) improving reproductive performance during early post-partum stages; ii) increasing ovulation and pregnancy rates in non-cyclic cows; iii) improving the conception rate in cows showing delayed ovulation; and finally, iv) eCG is currently included in protocols for fixed-time artificial insemination since after inducing the synchrony of ovulation using a progesterone-releasing device, eCG has beneficial effects on embryo development and survival. The above effects are not always observed in cyclic animals, but they are evident in animals in which LH secretion and ovarian activity are reduced or compromised, for instance, during the early post-partum period, under seasonal heat stress, in anoestrus animals or in animals with a low body condition score.

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Effect of eCG on early resumption of ovarian activity in postpartum dairy cows

Cited by 31 publications

References 42 publications

Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N’Dama cattle

Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N’Dama cattle

Short-Term Culture of Ovarian Cortical Strips From Capuchin Monkeys (Sapajus apella): A Morphological, Viability, and Molecular Study of Preantral Follicular Development In Vitro

Use of Equine Chorionic Gonadotropin to Control Reproduction of the Dairy Cow: A Review

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