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Development of an artificial insemination protocol in llamas using cooled semen
S M Giuliano1, M G Chaves, V L Trasorras
1Cátedras de Física Biológica, Buenos Aires, Argentina. smgiulia@fvet.uba.ar
Animal Reproduction Science
|April 17, 2012
Summary
Designing an artificial insemination (AI) protocol for llamas using cooled semen proved successful when using the lactose-egg yolk extender. Optimal pregnancy rates were achieved when insemination occurred close to ovulation, demonstrating the viability of cooled semen AI in llamas.
Area of Science:
- Veterinary Medicine
- Reproductive Biology
- Animal Science
Background:
- Artificial insemination (AI) in llamas is crucial for genetic improvement and conservation.
- Optimizing semen preservation techniques, such as cooling, is essential for expanding AI applications in camelids.
- Previous studies have explored various semen extenders, but optimal protocols for cooled llama semen are still being developed.
Purpose of the Study:
- To design and evaluate an artificial insemination (AI) protocol for llamas utilizing cooled semen.
- To identify the most effective semen extender for preserving llama sperm viability during cooling.
- To determine the optimal timing of insemination relative to ovulation for maximizing pregnancy rates with cooled semen.
Main Methods:
- Four semen extenders were tested: lactose-egg yolk (L-EY), Tris-citrate-fructose-egg yolk (T-F-EY), PBS-llama serum (S-PBS), and skim milk-glucose (K).
- Semen samples were cooled to 5°C for 24 hours, and L-EY was selected based on superior semen variable preservation.
- Llamas were inseminated with either a fixed dose of live spermatozoa (at 37°C or cooled) or whole ejaculate (cooled), with timing relative to ovulation varying across groups.
Main Results:
- The L-EY extender significantly outperformed other extenders in maintaining semen motility and live spermatozoa percentages.
- Pregnancy rates varied significantly by group: 75% (fixed dose, 37°C), 0% (fixed dose, 5°C), 0% (whole ejaculate, 5°C), and 23% (whole ejaculate, 5°C, near ovulation).
- Insemination timing relative to ovulation was a critical factor, with higher success rates when AI was performed closer to ovulation.
Conclusions:
- It is feasible to achieve llama pregnancies using artificial insemination with cooled semen.
- The lactose-egg yolk extender is effective for preserving llama semen quality during cooling.
- The success of cooled semen AI in llamas is highly dependent on the precise timing of insemination in relation to ovulation.
