Concentrations of steroid hormones, estrous, ovarian and reproductive responses in sheep estrous synchronized with different prostaglandin-based protocols

Fierro, S.; Viñoles, C.; Olivera-Muzante, J.

doi:10.1016/j.anireprosci.2016.02.009

Cited by 23 publications

(16 citation statements)

References 54 publications

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“…Finally, they concluded that prostaglandin-based protocols for TAI might increase pregnancy rates by increasing the interval between PGF2α injections. Also, Fierro et al (2016 published studies about ovarian follicular growth, concentrations of steroid hormones, estrous response, ovulation time, ovulation rate, conception, fertility and prolificacy rates after estrus synchronization with PGF2α, in order to identify which protocol was the most effective for TAI with fresh semen, establishing that the minimum length of the luteal phase prior to insemination, necessary for acceptable reproductive results, should be 12 days. Similarly, concluded that long intervals between PGF2α injections (15 or 16 days) determined better reproductive outcomes than mid intervals (12 or 13 days) after cervical TAI with fresh semen during the breeding season, equaling results achieved with the P 4 -eCG protocol.…”

Section: Estrus Induction and Synchronizationmentioning

confidence: 99%

Technical recommendations for artificial insemination in sheep

et al. 2019

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Artificial insemination (AI) was the first important biotechnology applied to improve the genetics of farm animals. It allows the rapid and massive diffusion of desirable characteristics of males with high productive potential. We describe the different types of estrus induction and synchronization techniques and the use of the AI with fresh, chilled or frozen semen. Through the adequacy of the protocols of estrus synchronization and AI to the different production systems, the efficient use of reproductive techniques is possible, reaching acceptable pregnancy rates. Summary of reproductive results obtained using cervical and laparoscopic AI are presented.

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Section: Estrus Induction and Synchronizationmentioning

confidence: 99%

Technical recommendations for artificial insemination in sheep

et al. 2019

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“…Las ovejas del grupo Criolla tuvieron mayores tasas de concepción y de fertilidad después de la detección del estro en comparación con el grupo Corriedale. Así, podría considerarse que las concentraciones altas de P4 pueden ser las responsables de unas mejores tasas de preñez (Fierro et al, 2016). También se puede sugerir que mayores concentraciones de P4, en los ciclos estrales anteriores a la monta, pueden estar relacionadas con mejores tasas de concepción, similar a lo referenciado por DeNicolo et al (2009).…”

Section: Resultados Y Discusiónunclassified

Secuencia de cambios de progesterona sérica durante el ciclo estral normal, preñez temprana y hembra repetidora en ovinos bajo condiciones de trópico alto Colombiano / Sequence of changes in serum progesterone during the normal estrous cycle, early pregnancy and female repeater in sheep under conditions of the Colombian high tropics

García¹,

Cruz²,

Lombana³

2021

Braz. J. Anim. Environ. Res.

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Se compararon los niveles de progesterona (P4) del ciclo estral normal (CN), con los de preñez temprana (CPñ) y hembra repetidora (CR). Ovejas adultas (n=32) Criollas, Corriedale, Hampshire y Romney Marsh se siguieron durante ciclo estral, apareamiento y preñez temprana, con muestreo sanguíneo realizado tres veces por semana, registrando el día de la monta. La cuantificación de P4 se realizó por enzimo-inmuno análisis (ELISA) y los perfiles de P4 se analizaron con modelo estadístico de medidas repetidas en el tiempo (GLM, SAS 2011). No se encontraron diferencias significativas (P0,05) en los niveles de P4 entre CPñ y CN durante los días 12-14 pos-ovulación. El perfil de CR presenta variaciones en la función lútea con bajos niveles de P4, indicando posible luteólisis funcional anticipada, que se anticiparía a la señal embrionaria necesaria para que se dé el reconocimiento materno de la preñez, que conduciría a mortalidad embrionaria temprana. Se observa que los perfiles de P4 son más bajos en el diestro para la raza Corriedale y Romney Marsh, en referencia a lo observado en las hembras Criollas, factor que puede estar asociado a las diferencias en eficiencia reproductiva entre estos grupos. Se debe seguir trabajando para entender los mecanismos que determinan la actividad del cuerpo lúteo, sus variaciones en la secreción de P4 durante el metaestro y diestro y, en cómo se determina su programación de tiempo de vida (luteolisis funcional – estructural), fenómeno modulador determinante durante el reconocimiento materno de la preñez, que conlleva a la supervivencia embrionaria.

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“…Hasani et al (2018) also reported similar findings when there were comparisons with a 12-day-interval PG treatment regimen with and without eCG administration. These differences in results among studies could be due to the hormonal status prior to fertilization as a result of the different intervals between PG administrations (Fierro et al 2016). Due to the longer interval between PG administrations, the time-interval is longer in which the dominant follicles have relatively greater progesterone concentrations in the follicular milieu, improving reproductive performance compared to short-and mid-interval treatment regimens (Fierro et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Addition of eCG to a 14 d prostaglandin treatment regimen in sheep FTAI programs

Cueto

Fernández

Fierro³

et al. 2020

Animal Reproduction Science

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Concentrations of steroid hormones, estrous, ovarian and reproductive responses in sheep estrous synchronized with different prostaglandin-based protocols

Cited by 23 publications

References 54 publications

Technical recommendations for artificial insemination in sheep

Technical recommendations for artificial insemination in sheep

Addition of eCG to a 14 d prostaglandin treatment regimen in sheep FTAI programs

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