The objective of this study was to evaluate the effect of the stage of the dominant follicle (df) at mating on the ovulation and embryonic survival in alpacas. A total of 116 alpacaswith ³15 day-post-partum resting period were used and evaluated by transrectal ultrasonography in order to distribute them in 4 groups: G1 (df in growing stage, diameter: 6 mm), G2 (df in growing stage, diameter: ³ 7 £ 12 mm), G3 (df in static stage, diameter: ³7 mm,) and G4 (df in regression stage, diameter: ³7 mm). Subsequently, all alpacas were mated except 5 alpacas of group G1 that rejected the male. Mating day was considered as day 0. Additional ultrasound evaluations were carried out on days 2 (occurrence of ovulation), 9 (presence and size of the corpus luteum); 20, 25, 30 and 35 (presence of embryonic vesicle or embryo). On day 15, a sexual receptiveness test was performed. Ovulationoccurredin97...

The relationship between day of collection and embryo recovery was studied inmultiparous adult alpacas. Females with ?7 mm follicles were superovulated, mated withfertile males (day 0 = day of service) and embryos were recovered on day 5 (G1), 6 (G2) and 7 (G3) post copula, where the number and size of corpora lutea were echographicallyevaluated. In Exp. 1, 14 females were slaughtered and embryos were recovered from theuterine horns and the oviduct. In Exp. 2, embryos were recovered in vivo from 21 females.Each uterine horn was flushed with 250 ml of PBS using a Foley catheter; and oviductswere flushed from the utero-tubal junction to the fimbria using 20 ml of PBS. The numberand rate of embryos recovered from the uterine horns was higher in G2 and G3 as comparedto G1 (p<0.05), while in the oviduct was higher in G1. Collected embryos from uterinehorns had the condition of excellent an...

The relationship between day of collection and embryo recovery was studied inmultiparous adult alpacas. Females with ?7 mm follicles were superovulated, mated withfertile males (day 0 = day of service) and embryos were recovered on day 5 (G1), 6 (G2) and 7 (G3) post copula, where the number and size of corpora lutea were echographicallyevaluated. In Exp. 1, 14 females were slaughtered and embryos were recovered from theuterine horns and the oviduct. In Exp. 2, embryos were recovered in vivo from 21 females.Each uterine horn was flushed with 250 ml of PBS using a Foley catheter; and oviductswere flushed from the utero-tubal junction to the fimbria using 20 ml of PBS. The numberand rate of embryos recovered from the uterine horns was higher in G2 and G3 as comparedto G1 (p<0.05), while in the oviduct was higher in G1. Collected embryos from uterinehorns had the condition of excellent an...

El objetivo del presente estudio fue evaluar el efecto del estadio del desarrollo folicular del folículo dominante (fd) al momento de la cópula, sobre la ovulación y supervivencia embrionaria en alpacas. Se utilizaron 116 animales con descanso post-parto ³15 días, que fueron evaluadas por ecografía transrectal para distribuirlas en 4 grupos: G1 (fd en estadio de crecimiento, diámetro: 6 mm), G2 (fd en estadio de crecimiento, diámetro: ³ 7 y £ 12 mm), G3 (fd en estadio estático, diámetro: ³7 mm) y G4 (fd en estadio de regresión, diámetro: ³7 mm). Posteriormente, fueron sometidos a monta controlada, a excepción de 5 alpacas del grupo G1 que rechazaron al macho. El día del empadre fue considerado el día 0. Evaluaciones ecográficas adicionales se realizaron los días 2 (ocurrencia de ovulación), 9 (presencia y tamaño del cuerpo lúteo); 20, 25, 30 y 35 (presencia de ves...

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