Natural Rescue and Resurgence of the Equine Corpus Luteum

Ginther, O.J.; Santos, V.G.

doi:10.1016/j.jevs.2014.10.004

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…In the follicular phase, minimum progesterone levels can be detected, accompanied by an increase in follicular diameter during estrus and ovulation (Ginther et al, 2007). This is because changes in plasma P4 levels occur immediately after ovulation (Ginther et al, 2008), reaching 3 ng / mL (Ginther and Santos, 2015), increasing to D6 after which they plateau (Arruda et al, 2001). Similar results were reported for Arabian mares (Abo-El maaty and El-Shahat, 2012), in which the P4 serum levels were significantly higher in the luteal phase of the estrous cycle.…”

Section: Discussionmentioning

confidence: 99%

The ovarian and uterine responses of Baixadeiro mares to prostaglandin synchronization during the dry and rainy seasons

et al. 2022

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This study aimed to evaluate the effect of synchronization with prostaglandin F2α in Baixadeiro mares during the rainy and dry seasons. Fourteen mares were synchronized by administering two doses of 1 mL prostaglandin PGF 2α and monitored by rectal palpation and ultrasound for the assessment of follicular development and uterine echotexture. Of this total, nine mares allowed the collection of blood, in which the blood was collected by venipuncture of the jugular vein to determine progesterone (P4) by ELISA. Mares showed no differences (P > 0.05) in weight, body score condition (BSC), tone, uterine edema, frequency of ovulation, synchronization interval, estrus, and the total number of follicles between periods. However, there was a difference in large increased follicle diameter (P < 0.05) during the dry season. The average concentrations of P4 in mares differed (P < 0.05) between the pre-and post-ovulatory phases for both seasons and after ovulation, with higher concentrations in the rainy season. Furthermore, statistical differences in daily light (P < 0.05) were observed between the dry and rainy periods. Thus, we conclude that mares from the genetic grouping Baixadeiro showed no reproductive seasonality, though there was a difference in luminosity between the rainy and dry seasons. The treatment with two doses of PGF 2α was effective in synchronizing the mares, promoting the return of estrus in the dry and rainy periods. The mares remaining cyclically active throughout the year provided there were appropriate forage availability and quality levels to allow for normal values of body weight and condition.

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Section: Discussionmentioning

confidence: 99%

The ovarian and uterine responses of Baixadeiro mares to prostaglandin synchronization during the dry and rainy seasons

et al. 2022

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“…The cups are mature and robustly secreting eCG at approximately days 50-60, but they will subsequently undergo sloughing by days 100-150 in most mares This resurgence phase of P 4 secretion by the primary CL is termed the "secondary luteal phase or output 2," whereas the production by supplementary CL is termed the "third luteal phase" or "output 3". These accessory CLs formed, respectively, causing an increase in P 4 secretion around the 75th day of gestation [27,28,111]. Thus, during this period, two secretion peaks of P 4 are described, which gradually decreasing to undetectable levels at the 200 days of gestation [112,113].…”

Section: Hormonal Regulation Of Pregnancy In Normal Mares 41 Progestmentioning

confidence: 96%

Physiological and Clinical Aspects of the Endocrinology of the Estrous Cycle and Pregnancy in Mares

Satué¹,

Gardón²

2021

Animal Reproduction in Veterinary Medicine

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The use of advanced reproductive endocrinology can generate important economic benefits for equine breeding farms. Pregnancy in the mare involves considerable endocrine changes, which can be explained in part by the development of different structures such as embryonic vesicles, primary and secondary CL, endometrial cups and development of fetoplacental units. Both the pregnant mare and the fetus adapt to this development with unique mechanisms, such as alterations in the maternal endocrine metabolism and hormonal feedback. Since the ability to produce a viable foal is critical for the broodmare, the maintenance of the gestation implies almost a year of physiological effort. Therefore, the joint knowledge of basic reproductive science and current clinical endocrinology allows veterinarians and breeders to be better positioned to achieve their objectives. This chapter reviews normal and abnormal endocrine patterns during the equine estrual cycle, pregnancy. We also consider hormonal evaluation related to placentitis, abortions, recurrent pregnancy loss, and premature deliveries. Also, several aspects associated with endocrinological control of the reproductive cycle, ovulation, parturition, high-risk mare, and hormone supplementation will be developed.

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