Size of Ovulating Follicle, Corpus Luteum and Blood Progesterone in Heifers Receiving Embryos from Three Grazing Breeds in Ecuador

Luis Ayala Guanga; José Pesántez Pacheco; Ermes Rodas Carpio; María Méndez Álvarez; Manuel Soria Parra; Carlos Torres Inga; Juan Vázquez Mosquera; Elizabeth del Rocío Pesántez Calle

Luis Ayala Guanga School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
José Pesántez Pacheco School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
Ermes Rodas Carpio School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
María Méndez Álvarez School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
Manuel Soria Parra School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
Carlos Torres Inga School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
Juan Vázquez Mosquera School of Veterinary Medicine, Faculty of Agricultural Sciences, University of Cuenca, Ecuador
Elizabeth del Rocío Pesántez Calle

Palabras clave: dairy cattle, ovary, follicle dynamics, estrus cycle, breeding, blood progesterone

Resumen

The aim of this paper was to determine the size of the pre-ovulation follicle in the corpus luteum, and in blood progesterone on the sixth and twelfth days after ovulation, in Holstein, Brown, Swiss and Criollo breeds grazing in Ecuadoran Highlands. The size of the pre-ovulation follicle and corpus luteum, and the blood progesterone levels were determined on days six and twelve, in nine heifers from each breed. Assessment of ovarian structures was made by ultrasound scanning. The concentration of blood progesterone was determined by electrochemiluminescence. The pre-ovulation follicle in Criollo heifers was larger (14.6 ± 0.41 mm) than in Holstein (12.7 ±0.47 mm), and in Brown Swiss (12.7 ± 0.65 mm). The progesterone concentration on days six and twelve after ovulation of Criolla heifers was higher than for Holstein and Brown Swiss (11.0 ± 1.68 ng/ml, and 18.4 ± 2.04 ng/ml, respectively). The linear association values were high and significant (P < 0.05) in the pre-ovulation follicle, corpus luteum and progesterone, in Holstein and Brown Swiss. It was demonstrated that for every additional millimeter above the Criollo mean on the sixth day, 1.67 ng/ml more of progesterone was generated in Criollo heifers (P < 0.05) than in the rest. It was concluded that the Criollo heifers had higher progesterone levels than Holstein and Brown Swiss on the sixth and twelfth days, thus producing better conditions in the uterus, with lower early embryo losses.

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