Comparative Efficacy of Histrelin Acetate and hCG for Inducing Ovulation in Brazilian Northeastern Jennies (Equus africanus asinus).

The research aimed to determine if and how effectively histrelin acetate and human chorionic gonadotropin (hCG) stimulated ovulation in Brazilian Northeastern jennies (Equus africanus asinus). The study found that both agents were successful in triggering ovulation within 48 hours of administration.

Methodology and Overall Implementation

• Thirty cycles from ten jennies were randomly assigned to one of three groups: G0 being the control group, G1 which received 250 µg of histrelin acetate, and G2 which received 2500 IU of hCG.
• Jennies were monitored through transrectal palpation and ultrasonography to check for the presence of a follicle measuring between 29 and 32 mm in diameter. Once such a follicle was confirmed, an ovulation-inducing agent was administered.
• The jennies were monitored every six hours using transrectal ultrasonography until ovulation occurred.

Key Findings and Significance

• The time between prostaglandin administration and ovulation was significantly lower in both treatment groups (G1, G2) compared to the control group (G0).
• The average ovulation times for G1 and G2 jennies were 145.2 and 147.4 hours respectively, lower than the average of 220 hours in the control group.
• Both treatments (G1, G2) also reduced the interval that jennies took to ovulate after the administration of the ovulation-inducing agent compared to the control group. The times for G1 and G2 were 41.15 and 37.8 hours respectively, compared to 81.8 hours in the control group.
• All jennies in both treatment groups ovulated within 48 hours after ovulation induction, while 100% of jennies in the control group ovulated later (more than 48 hours from administration).

Conclusions

• The study concluded that both histrelin acetate and hCG are efficient ovulation-inducing agents in jennies.
• These findings are significant as they provide insights and practical tools to control the reproductive cycle of the species in question, which potentially has implications for animal breeding and conservation efforts.