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Zootecnia Tropical
Instituto Nacional de Investigaciones Agrícolas Venezuela
ISSN: 0798-7269
Vol. 24, No. 3, 2006, pp. 297-306
Bioline Code: zt06024
Full paper language: Spanish
Document type: Research Article
Document available free of charge

Zootecnia Tropical, Vol. 24, No. 3, 2006, pp. 297-306

 es Ondas foliculares ováricas en vacas Brahman y Mestizas ( Bos indicus check for this species in other resources x Bos taurus check for this species in other resources ), ubicadas en los llanos centrales venezolanos
Lílido N. Ramírez-Iglesia, Freddy B. Viera Rosales, Jesús A. Martínez, Adelina Díaz de Ramírez, José G. Morillo Luque, Rafael Román y Eleazar Soto-Belloso

Resumen

El propósito de este estudio fue contribuir al conocimiento de la fisiología reproductiva en vacas Brahman y Mestizas ( Bos indicus check for this species in other resources x Bos taurus check for this species in other resources ), localizadas en los Llanos Centrales de Venezuela, a través del estudio de la dinámica folicular ovárica durante el ciclo estral por ultrasonografía, en vacas multíparas. Se monitoreó el crecimiento folicular ovárico en 30 vacas multíparas durante 30 días consecutivos en la época de lluvias. La onda folicular se definió como el período entre la emergencia de dos folículos dominantes consecutivos. Se observaron ciclos con una (6,7%), dos (90,0%) y tres (3,3%) ondas de crecimiento folicular. Hubo diferencias significativas (P<0,05) en la duración del ciclo estral entre los ciclos que presentaron tres ondas foliculares (27,0 días) en comparación con los ciclos que presentaron una y dos ondas (20,6 22,3 días, respectivamente). No hubo diferencias en la duración del ciclo estral entre las vacas Brahman y Mestizas. La dinámica folicular en ambas razas se caracterizó por una mayor frecuencia de ciclos con dos ondas. La razón por la cual existen ciclos con 1, 2, 3 o más ondas no se conoce. Sin embargo, es posible que en aquellas vacas con mayores niveles de progesterona se presenten mayor número de ondas de crecimiento folicular. En conclusión, la dinámica folicular ovárica de vacas Brahman y Mestizas ubicadas en los Llanos Centrales de Venezuela se caracterizó por presentar una mayor frecuencia de ciclos estrales con dos ondas foliculares.

Palabras-clave
ondas foliculares, ciclo estral, ultrasonograma, mestizas (Bos indicus x Bos taurus), Brahman.

 
 en Ovarian follicular waves in Brahman and crossbred ( Bos indicus check for this species in other resources x Bos taurus check for this species in other resources ) cows, located in Venezuelan central plains
Lílido N. Ramírez-Iglesia, Freddy B. Viera Rosales, Jesús A. Martínez, Adelina Díaz de Ramírez, José G. Morillo Luque, Rafael Román y Eleazar Soto-Belloso

Abstract

The aim of this study was to contribute to the knowledge of reproductive physiology in Brahman and Crossbred ( Bos indicus check for this species in other resources x Bos taurus check for this species in other resources ) cows located in the Central lowlands of Venezuela, using a ultrasound study of follicular dynamics in multiparous cows during the estrous cycle. Follicular growth and atresia were monitored in 30 multiparous cows during 30 consecutively days during the rainy season. The follicular wave was identified using the dominant follicle of each wave. Estrous cycles with one (6.7%), two (90.0%) and three (3.3%) follicular waves were observed. There was a difference (P<0.05) in estrous cycle length according the number of follicular waves, observing that estrous cycles with three waves were longer (27.0 days) than cycles with one or two waves (20.6 22.3 days, respectively). There was no difference (P>0.05) between Brahman and Crossbred cows, in estrous cycle length. Follicular dynamics in both breeds were characterized by a higher incidence of cycles with two waves. The reason for which cycles exist with 1, 2, 3 or more waves are not known. However, it is possible that in those cows with high progesterone levels present high number of follicular waves. In conclusion, the ovarian follicular dynamic of Brahman and Crossbred cows located in Central Plains of Venezuela was characterized to present a bigger frequency of estrous cycle with two follicular waves.

Keywords
follicular waves, estrous cycle, ultrasound, crossbred (Bos indicus x Bos Taurus), Brahman.

 
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