Abstract
Alpacas, as other camelids, are inducer ovulators and FIO/NGF-β, a protein present in the seminal plasma (SP) is reported as the responsible of the ovulation (Kershaw-Young et al. 2012 Reprod. Fertil. Dev. 24, 1093-1097, 10.1071/RD12039). However, limited and controversial information exists regarding characteristics of follicular wave in alpacas post-induction of ovulation with SP or other stimulus. The experiment was designed to determine the effect of 3 external stimulations on the interval to follicular wave emergence and the interval to dominant follicle. Adult female alpacas between 5 and 6 years old were assigned to 1 of 3 treatments: (1) SP (n = 6): 1 mL of SP IM; (2) hCG (n = 5): 1000 IU of hCG (Pregnyl, Organon-Holland, Amsterdam, the Netherlands), via IM; or (3) follicular ablation (FA, n = 6): animals were induced by ultrasound-guided ablation of the dominant follicle ≥7 mm. Alpacas from treatments 1 and 2 were examined by ultrasonography (Aloka SSD 500, transducer 7.5 MHz; Aloka, Tokyo, Japan) at 1- to 2-h intervals between 22 and 30 h after treatment or until ovulation occurred, whichever occurred first. All animals were evaluated by ultrasonography every day from Day 2 to Day 7 post-treatment and after that on Days 9, 12, and 15 post-treatment. Data from one alpaca (FA group) was excluded because of problems in the timing of ablation. Therefore, the total number of alpaca used was 16 (SP = 6, hCG = 5, and FA = 5). Results of the effect in external stimulation were analysed using ANOVA. In conclusion, interval to the emergence of a new follicular wave on the detection of follicles ≥3 mm and interval to dominant follicle ≥7 mm differed for FA compared with hCG but not compared with SP treatment. Table 1.Follicular wave emergence (mean ± SEM) under 3 external stimulations: seminal plasma (SP), hCG, or follicular ablation (FA)
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