Publication: Interacción materno-embrionaria en la especie bovina : implicaciones para el desarrollo y la calidad embrionaria
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2019-04-25
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Universidad Complutense de Madrid
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Abstract
El período preimplantacional representa una etapa crítica durante el desarrollo embrionario. In vivo, el embrión bovino pasa los primeros cuatros días en el oviducto donde está en contacto con el fluido oviductal (oviductal fluid, OF). Durante este período ocurren importantes cambios morfológicos y metabólicos, que incluyen la primera división mitótica y la activación del genoma embrionario (embryo genome activation, EGA). Luego, el embrión entra en el útero y permanece flotando libremente en el fluido uterino (uterine fluid, UF) hasta el inicio de la implantación a los 19-22 días aproximadamente. Generalmente, en ganadería, la alta tasa de perdida gestacional se atribuye a la pérdida embrionaria temprana, es decir, antes del reconocimiento materno del embarazo. Por lo tanto, el estudio de los mecanismos fisiológicos y las interacciones durante ese periodo es esencial para comprender el proceso de desarrollo embrionario temprano y para disminuir la pérdida embrionaria...
The early preimplantation period represents a critical period during embryo development. In vivo, the bovine embryo spends the first four days in the oviduct where it is in contact with epithelia cells and oviductal fluid (OF). During this period, important morphological and metabolic changes occur, including the first mitotic division and embryonic genome activation (EGA). Then, the embryo enters the uterus and remains free floating in the uterine fluid (UF) until the initiation of implantation at approximately Days 19–22. In cattle, the high failure rate to maintain pregnancy is generally attributed to early embryonic loss prior to maternal recognition of pregnancy. Thus, the study of physiological mechanisms and interactions during the preimplantational period is essential to understand early embryo development process and to decrease embryonic loss...
The early preimplantation period represents a critical period during embryo development. In vivo, the bovine embryo spends the first four days in the oviduct where it is in contact with epithelia cells and oviductal fluid (OF). During this period, important morphological and metabolic changes occur, including the first mitotic division and embryonic genome activation (EGA). Then, the embryo enters the uterus and remains free floating in the uterine fluid (UF) until the initiation of implantation at approximately Days 19–22. In cattle, the high failure rate to maintain pregnancy is generally attributed to early embryonic loss prior to maternal recognition of pregnancy. Thus, the study of physiological mechanisms and interactions during the preimplantational period is essential to understand early embryo development process and to decrease embryonic loss...
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Tesis de la Universidad Complutense de Madrid, Facultad de Veterinaria, Departamento de Fisiología Animal, leída el 16-05-2018