GONADOTHOPIN RELEASING HORMONE (GNRH) AND EQUINE CHORIONIC GONADOTROPIN (ECG) IMPROVE THE PREGNANCY RATE ON PROTOCOLS FOR TIMED-ARTIFICIAL INSEMINATION IN BEEF CATTLE
Palabras clave:
fixed-time artificial insemination, beef cattle, estrus synchronization, GnRH, eCGResumen
El estudio tuvo como objetivo verificar la influencia de la GnRH y eCG en protocolos de
IATF para mejorar la tasa de preñez (TP) en ganado para carne, previamente tratados con
progesterona intravaginal una acción prolongada en la temporada de cría de 90 días. El total
de 660 hembras fueron divididas en cinco grupos: (TAI1) inyección de 1,0 mg de benzoato de
estradiol (BE) y P4 en dia 0(d0), remoción de la P4 + 0,075 mg prostaglandina F2a en d9, 1,0
mg de EB en d10 y TAI 32h (n = 120); (TAI2) lo mismo TAI1, pero la inclusión de 500µg de
GnRH en TAI (n = 120); (TAI3) lo mismo TAI1, pero la administración de 400 UI eCG en
d10 (n = 120); (TAI4) lo mismo TAI3, pero la administration de 500µg de GnRH en TAI (n =
120); (5) sin la sincronización de celo, pero servida por monta natural (MN, n = 180).
Cuarenta y cinco días después de la TAI, el TAI1, TAI2, TAI3, y el grupo TAI4 quedarón con
los toros por 45 d. La gestatión fue determinada por ultrasonografía en 45d despues de TAI y
en 120d después para todos los tratamientos. No hubo diferencias en TP entre los cuatro
protocolos de TAI en d45 (vacas: TAI1 = 48,0%, TAI2 = 53,8%, TAI3 = 57,6% = TAI4
58,3%; vaquillas: TAI1 = 53,3%, TAI2 = 57,1%, TAI3 = 57,1% , TAI4 = 56,2%). El TP
después de la temporada de cría de 90 días fue mayor en todos los grupos de vacas TAI
(P<0,0001) en comparación con MN, a excepción de las novillas (p>0,05). Vacas y novillas
fueran analizadas en conjunto, y no se encontraron diferencias entre los grupos. Se concluyó
que el TAI usando protocolos de la GnRH o ECG solos o juntos, colaboran significativamente
a mejorar la tasa de preñez en el ganado hembra cuando se somete a un tratamiento previo
con la progesterona en la fase reproductiva.
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