Hormonal Stimulation in a Gonadal Dysgenesis Mare

Larentis, Gustavo Rupp; Bastos, Henrique Boll de Araujo; Centeno, L. A. M.; Bueno, Verônica La Cruz; Bringel, B.A.; Mattos, Rodrigo Costa

doi:10.1016/j.jevs.2020.103154

Cited by 2 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This condition may indicate an extended period without exposure to ovarian steroids (Larentis et al, 2020), which is not the case of cycling cattle, as the recipients used in our study.…”

Section: Ta B L Ementioning

confidence: 95%

Uterine tone: A neglected criterion for the selection of bovine embryo transfer recipients

Guimarães,

Seber,

Neto

et al. 2024

Reprod Domestic Animals

View full text Add to dashboard Cite

This study evaluated the relationship between CL features assessed by ultrasound (luteal tissue area and blood flow, BF) or rectal palpation (size), uterine tone (UT), plasma progesterone (P4) concentration on Day 7 (D7) and subsequent pregnancy outcomes in bovine embryo recipients. A total of 163 cows and heifers were included in this study. The expected day of ovulation after the synchronization protocol was designated as D0. On D7, ovaries and uterus were examined by ultrasonography and rectal palpation, and subjective scores (1–3 scale) were assigned for CL size, area and BF, and for UT. Blood samples were collected for further P4 analysis. Each embryo recipient then received a grade I frozen–thawed in vivo‐produced blastocyst, which was transferred to the uterine horn ipsilateral to the CL. Pregnancy diagnosis was performed on D35, and the results were retrospectively compared with the assigned scores for CL and UT. We observed a significant (p < .02) interaction between CL size and UT, with a progressive increase in the likelihood of pregnancy for recipients bearing a large CL among those with turgid UT. Ultrasound scoring of the CL using B‐mode and Doppler‐mode did not significantly predict pregnancy rates on D35 (p < .6 and p < .5, respectively). However, logistic regression analysis revealed a trend towards a quadratic effect (p < .08 and p < .06) indicating that the probability of pregnancy varied according to the area of luteal tissue and P4 concentrations, respectively. No significant (p > .05) association was found between the probability of pregnancy and the BF area of the CL. In summary, UT before embryo transfer may reflect successful recipient synchronization. Elevated P4 levels, assessed by CL size, may offset uterine contractility, mitigating adverse effects. Additionally, the CL area may be more important than its vascularization area when evaluating recipients D7 after ovulation.

show abstract

“…This condition may indicate an extended period without exposure to ovarian steroids (Larentis et al, 2020), which is not the case of cycling cattle, as the recipients used in our study.…”

Section: Ta B L Ementioning

confidence: 95%

Uterine tone: A neglected criterion for the selection of bovine embryo transfer recipients

Guimarães,

Seber,

Neto

et al. 2024

Reprod Domestic Animals

View full text Add to dashboard Cite

show abstract

“…By comparing our data with Larentis' et al (2020) findings, uterine edema probably occurred due to the absence of exogenous P4 effect, instead of exogenous E2 effect promoting better estrogenic follicular competence. In fact, Larentis et al (2020) demonstrated that exogenous administration of E2 and P4 can act directly in the mare's uterus even when ovarian hormonal activity is not involved. Mares exhibiting the condition referred as equine Turner's syndrome, that is, lack of one X chromosome (X0)…”

Section: Discussionmentioning

confidence: 53%

“…Subsequently, these mares were used as recipients in equine ET programs. Larentis et al (2020) provided evidence that the 17β E2 and long action P4 (P4-300®) can induce the formation of steroid receptors in the endometrium in X0 mares. This study demonstrated that the uterus of an X0 mare can respond to hormonal treatment even in the absence of hormonal ovarian activity.…”

Section: Discussionmentioning

confidence: 99%

>b<Hormonal strategies for follicular atresia induction and stimulation of emergence of a new follicular wave in mares>/b<

Reway¹

View full text Add to dashboard Cite

Hormonal Stimulation in a Gonadal Dysgenesis Mare

Cited by 2 publications

References 27 publications

Uterine tone: A neglected criterion for the selection of bovine embryo transfer recipients

Uterine tone: A neglected criterion for the selection of bovine embryo transfer recipients

>b<Hormonal strategies for follicular atresia induction and stimulation of emergence of a new follicular wave in mares>/b<

Contact Info

Product

Resources

About