Corpora lutea in superovulated ewes fed different planes of nutrition

Kraisoon, Aree; Redmer, Dale A.; Bass, Casie S.; Navanukraw, Chainarong; Dorsam, Sheri T.; Valkov, Veselina; Reyaz, Arshi; Grazul-Bilska, Anna T.

doi:10.1016/j.domaniend.2017.08.002

Cited by 14 publications

(5 citation statements)

References 57 publications

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“…Similarly, ewes achieved a higher ovulation rate and earlier embryonic development when fed 0.5 times their daily maintenance requirement, but reduced total number of viable embryos [ 24 ]. Conversely, a significantly lower ovulation rate for underfed ewes when compared with overfed and control ewes [ 104 ]. Similarly, a decreased number of follicles in underfed ewes as compared to control and overfed ewes treated with FSH [ 25 ].…”

Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

“…Moreover, the molecular biology behind these processes is poorly understood, and may involve nutritional signals acting directly on the uterus, which modifies the embryo environment and thus, its survival. Some inconsistent results are likely due to differences in experimental designs, level of diet excess or restriction, and/or nutritional plane, such as length of nutritional treatment before conception/fertilization, and diet formulation [ 104 ]. Furthermore, nutritional status can be considered a key factor influencing ART efficiency.…”

Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

“…Furthermore, nutritional status can be considered a key factor influencing ART efficiency. Hence, any donor and recipient will require specific nutritional management before or during any MOET program [ 103 , 104 ].…”

Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

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Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation

Khan

Jamal

et al. 2022

Veterinary Sciences

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Considerable improvements in sheep multiple ovulation and embryo transfer (MOET)protocols have been made; however, unlike for cattle, MOET is poorly developed in sheep, and thus has not been broadly applicable as a routine procedure. The tightly folded nature of the ewe cervix, the inconsistent ovarian response to various superovulatory treatments, and the requirement of labor to handle animals, particularly during large-scale production, has limited the implementation of successful MOET in sheep. Moreover, several extrinsic factors (e.g., sources, the purity of gonadotrophins and their administration) and intrinsic factors (e.g., breed, age, nutrition, reproductive status) severely limit the practicability of MOET in sheep and other domestic animals. In this review, we summarize the effects of different superovulatory protocols, and their respective ovarian responses, in terms of ovulation rate, and embryo recovery and transfer. Furthermore, various strategies, such as inhibin immunization, conventional superovulation protocols, and melatonin implants for improving the ovarian response, are discussed in detail. Other reproductive techniques and their relative advantages and disadvantages, such as artificial insemination (AI), and donor embryo recovery and transfer to the recipient through different procedures, which must be taken into consideration for achieving satisfactory results during any MOET program in sheep, are also summarized in this article.

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Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

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Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation

Khan

Jamal

et al. 2022

Veterinary Sciences

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“…The secondary antibody, goat antirabbit IgG (H + L) (Biotin, Cat #65-6140, 1:10,000 dilution; Thermo Fisher Scientific, Rockford, IL, USA), was added to detect Ki-67 and ESR2 and incubated for 1 h. For color development, diaminobenzidine (D22187, Kit #3, 1:10 in PBS and 1:1000 in a final concentration of 0.03%) with streptavidin HRP substrate was used, and nuclei were counterstained with Mayer's Hematoxylin (MHS32; Sigma-Aldrich, St. Louis, Missouri, USA). For control sections, the primary antibodies were replaced by 1% blocking reagent solution at the same dilution as described previously (Kraisoon et al, 2018).…”

Section: Immunohistochemistrymentioning

confidence: 99%

Effects of FSH treatment and withdrawal during proestrus on uterine proliferation and steroid hormone receptor expression in beef heifers

Bunma

Kanjanaruch

Kogram

et al. 2021

Animal Science Journal

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To determine the effects of Follicle Stimulating Hormone (FSH) treatment and subsequent withdrawal on uterine proliferation and estrogen receptor (ESR), Brahman crossbred heifers (n = 12) were twice daily injected with FSH (4, 3, and 2 mg/injection) on Days 17–19 of the estrous cycle (FSH 3 days) and (4 and 3 mg/injection) on Days 17–18 (FSH 2 days) and withdrawal with saline on Day 19 and (4 mg/injection) on Day 17 (FSH 1 day) and withdrawal with saline on Days 18–19. Uterine tissue was subjectively collected on Day 20 and microscopically classified to four regions: endometrial stroma (ES), surface endometrial gland (EG), deep endometrial gland (DG), and myometrium (Myo). The cell proliferation marker, Ki‐67, was quantified as labeling index (LI) in uterine regions, and tissues were immunostained to detect ESR2 followed by image analysis. The LI of ES, EG, and DG was greater (P = 0.0018, P = 0.0005, and P = 0.0103; respectively) in heifers received FSH for 3 days. The expression of ESR2 protein on ES and EG was greatest (P < 0.0001 and P = 0.0036, respectively) in FSH 3 days‐treated group. Thus, FSH administration during proestrus stimulates uterine cell proliferation, and ESR2 expressions are affected by FSH during proestrus and differentially distributed in the uterine regions.

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“…La fase folicular es el período que involucra la receptividad al macho hasta la ovulación, caracterizada por el aumento en la concentración de estrógenos (E 2 ) (1). La fase luteal es el periodo donde se forma el cuerpo lúteo (CL), considerado como una glándula endocrina transitoria que secreta la progesterona (P 4 ), y culmina con la luteolisis (6).…”

Section: Introductionunclassified

Concentraciones de progesterona durante el ciclo estral en ovinos en el trópico colombiano

Alvarado-García

Torres-Cruz²,

Lombana³

2024

Rev MVZ Córdoba

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Objetivo. Se evaluó la eficiencia en detección de calores, determinación de la duración y tipo de ciclo estral y concentración de progesterona en biotipos raciales ovinos, en el trópico alto. Materiales y Métodos. En 32 ovejas adultas, biotipo Criolla, Hampshire, Romney Marsh y Corriedale, durante el periodo posparto, se determinó la Eficiencia en Detección de Calores - EDC, tipo de ciclo: Corto – CC, Regular - CR y Largo - CL, Duración del Ciclo Estral – DCE y concentraciones de progesterona – CP4. Las CP4 se valoraron mediante técnica de ELISA. El análisis estadístico usó un modelo completamente al azar y medidas repetidas en el tiempo. Resultados. La EDC en promedio fue de 64.88%, presentándose 35.12% CC, 59.92% CR y 4.96% CL. El promedio de DCE regular fue de 16.9±0.89 días. El grupo Criollo presentó los mayores rangos de variación de la CP4, evidenciando cambios en su actividad esteroidogénica del cuerpo luteo semejante a lo observado con el grupo Hampshire. Entre el día 4 y 12 el grupo Romney Marsh presentó los menores CP4., siendo semejante al comportamiento del grupo Corriedale. Conclusiones. Las CP4 incrementan los días 2 a 6, manteniéndose altos y constantes entre los días 10 - 12, disminuyendo gradualmente hasta el día 18, evidenciando progresivamente una posible luteolisis funcional que conduce a una luteolisis estructural. Las CP4 pueden estar asociadas a fenómenos de adaptación de algunos grupos raciales, que afectan la eficiencia reproductiva que se observa es diferenciada entre ellos.

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Corpora lutea in superovulated ewes fed different planes of nutrition

Cited by 14 publications

References 57 publications

Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation

Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation

Effects of FSH treatment and withdrawal during proestrus on uterine proliferation and steroid hormone receptor expression in beef heifers

Concentraciones de progesterona durante el ciclo estral en ovinos en el trópico colombiano

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