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Facultad de Medicina Veterinaria y Zootecnia, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx
Mozaffari, Sirous, et al. (2022). Effect of the administration route of gonadotropin releasing hormone on the reproductive performance of multiparous Holstein cows: Effect of epidural vs intramuscular administration of GnRH .... Veterinaria México OA; Vol. 9, 2022. Recuperado de https://repositorio.unam.mx/contenidos/4133768
Autor(es)
Mozaffari, Sirous; Goli, Mojtaba
Tipo
Artículo de Investigación
Área del conocimiento
Biotecnología y Ciencias Agropecuarias
Título
Effect of the administration route of gonadotropin releasing hormone on the reproductive performance of multiparous Holstein cows: Effect of epidural vs intramuscular administration of GnRH ...
Fecha
2022-08-31
Resumen
We investigated the effect of epidural versus intramuscular administration of alarelin acetate (GnRHa; 25 μg) at artificial insemination (AI; day 0) and/or 7 days after AI on the pregnancy rate (PR) of Holstein cows that exhibited estrus spontaneously after their voluntary wait period. Cows (n = 117) were randomly allocated to treatment and control groups. In groups IM0, IM7, and IM07 (n = 12 per group), cows received GnRHa intramuscularly (IM) at 0 or 7 days, or both, respectively. In groups EP0 (n = 19), EP7 (n = 13) and EP07 (n = 11), cows received GnRHa at the sacrococcygeal epidural site (EP) at 0 or 7 days, or both, respectively. Animals in the control group (CON) received 5 mL of normal saline at 0 and 7 days. Pregnancy diagnosis was performed by rectal palpation of the uterine horns 60 days post AI. Results showed a significant difference in PR/first AI between IM0 and EP7 groups (16.67% vs. 61.54%; P < 0.05). Moreover, the results showed no significant differences in overall PR after two rounds of inseminations among all groups 60 days after the second AI. In conclusion, epidural injection of GnRHa 7 days after AI versus its intramuscular injection at AI improved PR/first AI significantly in Holstein lactating cows.
Tema
Artificial Insemination; Epidural Administration; Gnrh; Holstein Lactating Cows; Pregnancy Rate; Spontaneous Estrus; Animal Production
Idioma
eng
ISSN
ISSN electrónico: 2448-6760
