Revista de Investigaciones Veterinarias del Perú
The effect of GnRH administered around the time of maternal recognition of prenancy on the embryonic survival rate was studied. This study used 67 adult female alpacas sexually receptive to the male, and bearing a preovulatory follicle ≥ 7mm, detected by rectal ultrasonography. Animals were distributed in three groups: Go (n=23) as control; G1 (n=22) received 6 µg GnRH on day 4 after ovulation; and G2 (n=22) received 4 µg GnRH on days 8 and 9 after ovulation. The ocurrence of ovulation was confirmed through the detection of a corpus luteum (CL) on day 5 after ovulation. Fertilization and gestation viability were monitored by CL development, structural changes of the uterine horns and presence of the embryonic vesicle on days 12, 18, 25 and 30 after ovulation, using rectal ultrasonography. The female sexual receptivity to the male was simultaneously evaluated. The number of females that ovulate was 20, 22 and 21 in G0, G1, and G2, respectively, and was presumed that conception has occurred. However, on day 12 the embryo survival rate was 90.5% in G1, 75.0% in G0, and 76.2% en G2. . These differences were statistically different.
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Araínga, Mariluz; Leyva V., Victor; Garcia V., Wilber; and Franco LI., Enrique, "Efecto de la GnRH en el proceso del reconocimiento maternal de la preñez sobre la supervivencia embrionaria en alpacas." (2003). Journal Articles: Pharmacology & Experimental Neuroscience. Paper 30.