DOI: https://doi.org/10.21897/rmvz.1342

Morfometría folicular y luteal, concentración de progesterona y éxito de la gestación en vacas Holstein (Bos Taurus) en el trópico alto (Colombia)

Follicular and luteal morphometry, progesterone concentration and early gestation in Holstein cows (Bos Taurus) at high altitude in the tropics (Colombia)

Marbel Monroy G, Claudia Jiménez E, Aureliano Hernández V

Resumen


Objetivo. Evaluar la relación entre el diámetro del folículo ovulatorio (FO), el volumen del cuerpo lúteo (CL), los niveles séricos de progesterona (P4) con el éxito de la gestación. Materiales y métodos. En 19 vacas Holstein de 2 a 6 partos ubicadas en Bogotá, se evaluaron dos fases consecutivas a partir del día 40 postparto, la primera correspondió al ciclo estral y la segunda correspondió a la gestación temprana o repetición de celo. En cada fase se detectó el celo, se realizó ultrasonografía para evaluar el diámetro del FO, confirmar ovulación, y el volumen del CL los días 6, 9, 12 y 15; en estos días también se evaluó los niveles séricos de P4. En la segunda fase se realizó inseminación artificial (IA) y se diagnosticó la gestación 30 días post-IA. Resultados. El 47.36% de las vacas se diagnosticaron como gestantes y el 52.63% como no gestantes. Las gestantes presentaron diámetros de FO menores 17.85±2.39 mm al de las no gestantes (21.10±2.86 mm; p<0.05). Las vacas que presentaron diámetros de FO más pequeños tuvieron mayor posibilidad de quedar gestantes (OR=0.624, IC=95% (0.4-0.9) (p<0.05). Los animales gestantes y no gestantes presentaron similares volúmenes de CL (p=0.10) y niveles séricos de P4 (p=0.39) los días 6, 9, 12 y 15. Conclusiones. Se estableció una relación entre la probabilidad de gestación y el tamaño del FO. Vacas con FO de menor diámetro tuvieron mayor probabilidad de gestación. Otras variables como CL y niveles de P4 no fueron predictivos del éxito de la gestación.

Palabras clave


Postparto; ciclo estral; preñez; ovario; reproducción; dinámica folicular.

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Referencias


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