INVESTIGADORES
KONRAD Jose Luis
congresos y reuniones científicas
Título:
Timing effects of cidr removal in eCG/PGF2α- SOV protocols on in vivo embryo production in Bos indicus and Bos taurus x Bos indicus cattle breeds
Autor/es:
GUTIÉRREZ REINOSO, M.A.; ARRESEIGOR, C.; KONRAD, J.L.; MALDONADO VARGAS, P.; GARCÍA HERREROS, M.
Lugar:
Bologna
Reunión:
Congreso; 19th International Congress on Animal Reproduction; 2022
Institución organizadora:
ICAR
Resumen:
Equine chorionic gonadotropin-serum (eCG) has been used systematically in Bos taurus SOV but not as frequent in Bos indicus and its crossbreeds. The objective was to study the timing effects of CIDR removal in order to elucidate the differential effects on in vivo embryo production in Bos indicus and Bos taurus x Bos indicus cattle breeds. A total of 32 individuals [breeds: Brangus (BGUS; n=16); Brahman (BMAN; n=16); BC: 3-3.5] were divided randomly into 4 groups [BGUS-A (n=8); BMAN-A (n=8); BGUS-B (n=8), and BMAN-B (n=8)]. Two SOV protocols (A and B) were applied: Day 0: intravaginal P4 device (CIDR: 1.38 gr) + 2 mg Estradiol Benzoate E2B (im) + 50 mg P4 (im); Day 4: eCG-p (2,000 IU); Day 6: PGF2α im (2 doses; 150 μg D-cloprostenol each, am/pm); Day 7: CIDR removal (24 or 36h post-1st PGF2α application for A and B protocol, respectively); Day 8: 500 μg GnRH (48h post-1st PGF2α application) + FTAI. Embryo-derived traits scored: total structures (TS), transferable embryos (TE), degenerated structures (DS) and unfertilized oocytes (UFOs). Significant differences were observed in TS, being higher in BMAN-A (12.0±1.8) compared to BGUS-A (10.0±1.9), BGUS-B (10.2±1.8), and BMAN-B (9.5±1.4) groups (p