EQUINE CHORIONIC GONADOTROPHIN (ECG) STIMULATION DURING THE LUTEAL AND NON-LUTEAL PHASES ON OVARIAN RESPONSE AND EMBRYO QUALITY IN LLAMAS

• Autores: Evangelista V., Shirley, Cordero R., Aída, Santiani A., Alexei, Vásquez E., Martha, Cárdenas M., Oscar, Huanca L., Wilfredo
• Formato: artículo
• Fecha de Publicación: 2009
• Institución: Universidad Nacional Mayor de San Marcos
• Repositorio: Revistas - Universidad Nacional Mayor de San Marcos
• Lenguaje: español
• OAI Identifier: oai:ojs.csi.unmsm:article/528
• Enlace del recurso: https://revistasinvestigacion.unmsm.edu.pe/index.php/veterinaria/article/view/528
• Nivel de acceso: acceso abierto
• Materia: Fase luteal; fase no luteal; tratamiento superovulatorio; embrión; llama; luteal phase; non luteal phase; superovulatory treatment; embryo

The effect of superovulatory treatment during the two phases of the ovarian cycleon follicular growth and embryo quality was evaluated in 45 sexually adult llamas. Animals bearing a >7 mm follicle, observed by ultrasonography, were selected and allocated into 3 groups: T0 (non-stimulated), T1 (superovulatory treatment during the non luteal phase), and T2 (superovulatory treatment during the luteal phase). Animals in groups T1 and T2 received 1 ml of LH (day 0) for synchronization of the follicular wave and 1000 IU of eCG (day 3) as superovulatory treatment. Vaginal sponges impregnated with progesterone were used on days 3 to 7 in T2 to simulate the luteal phase. The induction of the ovulation (day 8) was done through natural mating and the application of GnRH (1 ml). Embryo recovery was done 7 days after natural mating (day 15) on T1 and T2. Similarly, embryo recovery was done 7 days after natural mating and application of GnRH in T0. The number of preovulatory follicles was larger in T1 (11.07 ± 7.53) and T2 (6.13 ± 7.11) than in T0 (1.07 ± 0.26) (p<0.05). The number of corpora lutea was larger in T1 (9.27 ± 3.37) than in T0 (1.07 ± 0.26) and T2 (6.47 ± 4.29) (p<0.05). The number of recovered embryos waslarger in T1 (3.47 ± 4.26) than in T0 (0.33 ± 0.48) and T2 (1.33 ± 2.53). The results showed that superovulatory treatment during the non luteal phase had a better response than superovulatory treatment during the luteal phase.