Follicular dynamics in Mangalarga mares

Buratini, J.; Silva, A. A. Rosa e; Barros, C. M.; Papa, Frederico Ozanam; Caldas, Maria Clara S; Meira, Cezinande de

doi:10.1111/j.2042-3306.1997.tb05091.x

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…Pubertal mares of this study had lower number of follicles per ovulatory waves which are similar to Miniature ponies that had fewer growing follicles≥10 mm per ovulatory wave and more ovulatory waves with only one follicle≥10 mm than large ponies and horses (Gastal et al, 2008). Maximum diameter of the preovulatory follicle was similar to that previously observed in mares (Buratini et al, 1997), but Miniature ponies had smaller perovulatory follicle diameter (38.3±0.7 mm) than in horses (44.5±1.4 mm; Gastal et al, 2008). The mean maximum diameter of the dominant follicle of pubertal fillies was nearly similar to that recorded for Mangalarga mares (Buratini et al, 1997), that was 39.0 ± 3.9 mm during one and was 34.7 ± 2.5 mm during two major follicular was per cycle but was higher than maximum diameter of the dominant follicle present in the secondary wave that was 34.3±11.0 mm (Buratini et al, 1997).…”

Section: Discussionsupporting

confidence: 82%

“…Maximum diameter of the preovulatory follicle was similar to that previously observed in mares (Buratini et al, 1997), but Miniature ponies had smaller perovulatory follicle diameter (38.3±0.7 mm) than in horses (44.5±1.4 mm; Gastal et al, 2008). The mean maximum diameter of the dominant follicle of pubertal fillies was nearly similar to that recorded for Mangalarga mares (Buratini et al, 1997), that was 39.0 ± 3.9 mm during one and was 34.7 ± 2.5 mm during two major follicular was per cycle but was higher than maximum diameter of the dominant follicle present in the secondary wave that was 34.3±11.0 mm (Buratini et al, 1997). The growth of the ovulatory follicle recorded in fillies is similar to that recorded in Lusitano mares from 7 days before ovulation (Mata, 2012) which started from 22.5mmon day 7 before ovulation to reach 45mm 24 hour before ovulation.…”

Section: Discussionsupporting

confidence: 82%

“…In addition to the breed difference, age (Carnevale et al, 1993), season (Pierson and Ginther, 1987), number of waves during the interovulatory interval (Ginther, 1993 ;Buratini et al, 1997) and the presence of more than one ovulatory follicle (Morel et al, 2010) all decrease the growth rate and the maximum diameter of the ovulatory follicles in addition to their effects on follicle populations.…”

Section: Discussionmentioning

confidence: 99%

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Follicular Dynamics in Pubertal Arab Mares during Spontaneous Estrus

Ghazy¹,

El‐Maaty²,

Noseir³

2015

AJVS

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This study aims to study the follicular changes during the estrous phase of 2 years pubertal mares showed previously signs of estrous and corpora lutae were detected on their ovaries. Five fillies of 2 years old were subjected to daily ultrasonographic examination for 18 days. Follicular dynamics were studied during estrus from day 6 before ovulation (-6) till day of ovulation (day 0). Follicles were classified into small (<10-15mm), medium (>15-<20) and large (>20). Number and diameter of each follicle was measured. Data was subjected to simple one way ANOVA to study the effect of day on number and growth rate of each follicle class. Results revealed that no significant variation was observed in number of all follicle classes. The dominant follicle after deviation to dominance starts to grow from >26mm in diameter to reach a maximum diameter of 42.3 mm on day of ovulation. At least one large follicle is dominant and the other large follicle is subordinate three days before ovulation. Compared to the day 6 before ovulation, the day before ovulation has significantly low large follicle number. There was a decrease of number and diameter of medium follicles on day 2 before ovulation. This study indicated that after ovulation fillies became much similar to mature and older mares. High genetic value fillies could be subjected to oocyte collection programs before enrolling her to either breeding program or performance.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Follicular Dynamics in Pubertal Arab Mares during Spontaneous Estrus

Ghazy¹,

El‐Maaty²,

Noseir³

2015

AJVS

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“…Determining the most appropriate moment to perform natural or artificial mating is essential to maximize conception rates through the breeding season in mares [1]. However, the long physiologic duration of the equine estrus, when compared to other domesticated livestock [2][3][4], makes it difficult to accurately predict the time of ovulation [5]. Currently, the use of ovulation-inducing therapies [6] and the visualization of impending ovulation indicators by B-mode ultrasound examination [7] has been applied to ensure breeding at the appropriate time.…”

Section: Introductionmentioning

confidence: 99%

Influence of two ovulation-inducing agents on the pituitary response and follicle blood flow in mares

et al. 2017

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The objective of the current study was to evaluate the effects of deslorelin and hCG, two ovulation-inducing therapies, on LH surge and follicle vascularity in mares. Thirty mares were either treated with 1.5 mg IM of deslorelin, 2,500 IU IV of hCG or 2 mL IM of NaCl 0.9% (GnRH, hCG and Saline groups, respectively). Power-flow Doppler examination and blood collection were performed every hour during the first 12 hours after treatment (H0) and every six hours between hours 12 (H12) and 30 (H30) after treatment. Moreover, endpoints were evaluated every hour through the last six hours before ovulation (OV-6 to OV-1). In GnRH group, plasma LH concentration progressively increased (P < 0.001) during the first 6 hours after treatment and remained high (P > 0.1) until OV-1. A significant increase in LH concentrations was first detected (P < 0.05) at 24 hours after treatment in hCG group, while no changes (P > 0.1) on LH levels were found during H0-H30 and between OV-6 and OV-1 in the Saline group. Independent of the treatment, significant variations on the percentage of the follicle wall with Doppler signals were not observed (P > 0.1) throughout the entire experiment. A weak correlation between the preovulatory follicle vascularity and the plasma LH concentration was found in GnRH, hCG and Saline groups (r = +0.29, +0.29 and -0.23, respectively; P ˂ 0.0001). These results described for the first time the immediate and continuous pituitary response to ovulation-inducing therapy with injectable deslorelin. Moreover, spontaneous and induced ovulations were not preceded by an increased follicle vascularity, which differs from previous reports in large animals.

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“…Reproductive Sciences 17(12) at UNIV OF VIRGINIA on September 29, 2012 rsx.sagepub.com Downloaded from…”

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confidence: 99%

Follicular Waves in the Human Ovary: A New Physiological Paradigm for Novel Ovarian Stimulation Protocols

et al. 2010

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Ovulation induction (OI) is a cornerstone of human assisted reproduction treatments (ART). Current OI protocols are based on the human follicular dynamics model known as propitious moment theory (PMT), by which follicles continuously grow from the primordial pool without any pattern, and follicular fate depend on the occurrence of a gonadotropin surge. Recently, a new paradigm of human follicular dynamics called follicular waves was revealed using sequential ultrasound examination of 1 interovulatory interval. Instead of random growth, follicles develop in coordinated groups or waves, occurring 2 to 3 times during an interovulatory interval. Follicular waves are common in several other mono-ovulatory species, like equines and bovines. In fact, this model was applied to the development of several OI protocols in veterinary medicine, especially in cows. It has been shown that synchronization of OI with the emergence of a follicular wave increases substantially success rates in animals, even with single embryo transfer. Veterinarians have already developed mechanisms to control wave emergence through mechanical or chemical ablation of the dominant follicle or corpus luteum. Considering the follicular dynamics similarities between humans and bovines regarding the follicular wave phenomenon, we hypothesize that synchronization of follicular wave emergence with ovarian stimulation produces more competent oocytes and embryos and will enhance ART efficiency in humans. At the end of this article, we propose 2 theoretical approaches to induce the emergence of a follicular wave in women: (1) a mechanical strategy by aspiration of the dominant follicle and (2) a pharmacological strategy by administering estradiol and progesterone.

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Follicular dynamics in Mangalarga mares

Cited by 8 publications

References 9 publications

Follicular Dynamics in Pubertal Arab Mares during Spontaneous Estrus

Follicular Dynamics in Pubertal Arab Mares during Spontaneous Estrus

Influence of two ovulation-inducing agents on the pituitary response and follicle blood flow in mares

Follicular Waves in the Human Ovary: A New Physiological Paradigm for Novel Ovarian Stimulation Protocols

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