Uterine hemodynamic evaluation of the beginning of diestrous in mares

Ignácio, Fernanda Saules; Canesin, Heloísa de Siqueira; Pantoja, J.C.F.; Romano, Rafael Mide; Filho, Luiz Fernando Novaes; Ferreira, Jair Camargo; Meira, Cezinande de

doi:10.1016/j.jevs.2012.05.026

Cited by 3 publications

(3 citation statements)

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“…Hendriks et al (2006) used hCG on day 7 postovulation in mares and were also unable to detect an effect of treatment on uterine vascularization, in accordance with Biermann et al (2014). Endometrial vascularization increased from day 1 to 2 postovulation, reaching maximum values on days 3 and 5, in agreement with Ignácio et al (2012) and Bollwein et al (1998). One possible explanation is the emergence of the first follicular wave that occurs during diestrus, increasing estrogen leves (Silva et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Effect of hCG application at different moments of the estrous cycle on corpus luteum and uterine vascularization and serum progesterone concentration in mares

et al. 2019

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Establishment of pregnancy after embryo transfer is the ultimate goal of an embryo transfer program and increasing pregnancy rates and reducing pregnancy loss are mandatory. The utilization of treatments to improve conception rates in recipient mares has been the focus of several research groups over the last years and the results are controversial. Some studies using human chorionic gonadotrophin (hCG) found promising results. Our hypothesis was that hCG administration would cause an additional stimulation on luteal function, uterine and luteal vascularization and progesterone concentration, and the mares would have increased uterine and cervix tone. Therefore, in the present study the effects of hCG administration to induce ovulation, on day 0 (day of ovulation) or day 5 postovulation were evaluated on corpus luteum characteristics, reproductive tract vascularization, and serum progesterone concentration from ovulation until day 15 postovulation. Groups were: G1: (control)-no hCG; G2: 2500 IU of hCG to induce ovulation when a follicle greater than 35mm and uterine edema were detected; G3: 2500 IU hCG on day 0; G4: 2500 IU hCG on day 5 postovulation. Twelve mares were randomly assigned to each group, during consecutive cycles, in a Latin Square experimental design, in a total of 48 cycles. Doppler ultrasound evaluations were performed daily from day 0 until day 15 postovulation, including mesometrial vascularity, endometrial vascularity and corpus luteum vascularity. Blood samples were collected for serum progesterone concentration. Data was analyzed using the Proc Glimmix SAS Procedure for nonparametric variables and Proc Mixed for parametric parameters. There was no treatment effect for all variables studied (P > 0.05). Characteristics were only affected by day (P < 0.05). It can be concluded that hCG administration at the time points suggested in the current study did not alter the characteristics evaluated.

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Section: Discussionmentioning

confidence: 99%

Effect of hCG application at different moments of the estrous cycle on corpus luteum and uterine vascularization and serum progesterone concentration in mares

et al. 2019

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“…During the CL life span, endocrine and vascular changes are dependant on the luteal angiogensis in the mare (FerreiraDias et al, 2006a,b). Doppler ultrasonography was used to determine normal and irregular alterations in the mare reproductive tract (Ignácio et al, 2011). In mares, the power Doppler display was used to evaluate CL (Bollwein et al, 2002a) and colour Doppler was also used to study luteal blood flow after induction of luteolysis (Ginther et al, 2007b).…”

Section: Introductionmentioning

confidence: 99%

“…In horses, a close relationship between luteal blood flow and progesterone during the entire estrous cycle was found (Bollwein et al, 2002a;Ginther et al, 2007a). Ovarian artery of the mare was also used to evaluate CL which can be also done with the measurement of the CL area with coloured signals as an indicator of the extent of blood flow (Ignácio et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Luteal blood flow and growth in correlation to circulating angiogenic hormones after spontaneous ovulation in mares

Abdelnaby¹,

El‐Maaty²

2017

BJVM

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For evaluating corpus luteum (CL) function, blood flow, circulating nitric oxide (NO), estradiol (E 2 ), progesterone, leptin and insulin like growth factor-I (IGF-1) concentrations were measured for 11 days that were equally divided into early and mid-luteal phases. Five mares underwent blood sampling and rectal Doppler ultrasound examination for 18 days for two estrous cycles. CL diameter, circumference, area and volume increased till day 11. Both blood flow blue area and power area increased from day 1 to 11 but colour blood flow red area declined till day 11. NO concentration increased till day 5 then decreased till day 11. Leptin concentrations declined from day 1 to 11. Power blood flow area and colour blood flow blue area exhibited a significant negative correlation with E 2 (r= -0.79; -0.75), leptin (r= -0.73; -0.51), and IGF-1 (r= -0.56; -0.60), but had a positive one with progesterone (r=0.47; 0.52). Days after ovulation and luteal phase affected significantly luteal blood flow and hormone concentrations. The relatively high E 2 , leptin, IGF-1 and NO during growth compared to static phase indicated a role enhancing angiogenesis and early CL development.

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Correlations of corpus luteum blood flow with fertility and progesterone in embryo recipient mares

Sales

Azevedo

Souza

et al. 2021

Trop Anim Health Prod

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Uterine hemodynamic evaluation of the beginning of diestrous in mares

Cited by 3 publications

References 2 publications

Effect of hCG application at different moments of the estrous cycle on corpus luteum and uterine vascularization and serum progesterone concentration in mares

Effect of hCG application at different moments of the estrous cycle on corpus luteum and uterine vascularization and serum progesterone concentration in mares

Luteal blood flow and growth in correlation to circulating angiogenic hormones after spontaneous ovulation in mares

Correlations of corpus luteum blood flow with fertility and progesterone in embryo recipient mares

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