Bibliographic citations
Cervantes, M., (2004). Estudio del efecto del estadio del desarrollo folicular al momento de la monta sobre la ovulación y sobrevivencia embrionaria en alpacas [Tesis, Universidad Nacional Mayor de San Marcos]. https://hdl.handle.net/20.500.12672/1352
Cervantes, M., Estudio del efecto del estadio del desarrollo folicular al momento de la monta sobre la ovulación y sobrevivencia embrionaria en alpacas [Tesis]. PE: Universidad Nacional Mayor de San Marcos; 2004. https://hdl.handle.net/20.500.12672/1352
@misc{sunedu/2878533,
title = "Estudio del efecto del estadio del desarrollo folicular al momento de la monta sobre la ovulación y sobrevivencia embrionaria en alpacas",
author = "Cervantes Flores, Miriam Pilar",
publisher = "Universidad Nacional Mayor de San Marcos",
year = "2004"
}
The objective of this study was to evaluate the effects of growth, static and regression stages of the dominant follicle during mating, on the ovulation and the embryonic survival in alpacas. 116 female alpacas with a post-partum resting period ³ 15 days were used. The alpacas were evaluated with an ultrasound scanner Aloka SSD 500 with a 7.5 MHz transrectal transducer in order to distribute them randomly in one of the following 4 groups: G1 (dominant follicle in growth stage, diameter of 6 mm), G2 (dominant follicle in growth stage, diameter ³ 7 £ 12 mm), G3 (dominant follicle in static stage, diameter ³ 7 mm) and G4 (dominant follicle in regression stage, diameter ³ 7 mm). Subsequently, all the alpacas were mated with a male, except 5 alpacas of group G1 that rejected the male. The mating day was considered day 0, thus the subsequent ultrasound evaluations were carried out on days 2 (ocurrence of ovulation), 9 (presence and size of the corpus luteum); 20, 25, 30 and 35 (presence of the embryonic vesicle and/or the embryo). On days 0 and 15, the sexual receptiveness test was performed. 97.3% of alpacas that were mated (n=111) presented ovulation, but no significant differences (p<0.05) among the study groups (G1=95.45%, G2=96.67%, G3=100% and G4=96.56%) were observed. The embryonic survival rate was also not significantly different among the groups, but there was a tendency to a greater rate of survival for the group G2 (65.52%) in comparison with groups G1 (52.38%), G3 (53.33%) and G4 (42.86%) on day 35 after mating. On day 9, no significant difference in the average size of the corpus luteum was observed among the groups (G1 = 10.28 ± 1.74mm, G 2 =11.72 ± 1.73mm, G3 = 11.07 ± 1.96mm, G4 = 11.11 ± 2.23mm). These results suggest that the stage of the follicular development during mating does not have a significant effect on the rate of ovulation and embryonic survival in alpacas.
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