Introduction
The West African Dwarf (WAD) goat is one of Nigeria's most resilient livestock breeds, known for its trypanotolerance and adaptability to humid zones. Despite these qualities, systematic semen evaluation and artificial insemination programmes targeting WAD goats remain limited.
This guide outlines practical approaches to semen collection and quality evaluation that field practitioners can implement with modest laboratory infrastructure.
Semen Collection
The electroejaculator and artificial vagina are the two primary collection methods. For WAD bucks, the artificial vagina (AV) method is preferred due to:
- Lower stress response
- Better semen quality outcomes
- Ease of use with trained animals
Collection should occur in the cooler morning hours, away from female goats to minimise distraction.
Quality Parameters
Standard semen evaluation covers the following parameters:
| Parameter | Acceptable Threshold |
|---|---|
| Volume | ≥ 0.5 mL |
| Mass motility | ≥ 3 (scale 0–5) |
| Progressive motility | ≥ 60% |
| Sperm concentration | ≥ 2 × 10⁹/mL |
| Morphological normality | ≥ 70% |
Staining and Morphology Assessment
Eosin-nigrosin stain remains the gold standard for assessing live/dead ratio and identifying morphological defects. Common defects in WAD bucks include:
- Proximal cytoplasmic droplets
- Bent midpieces
- Detached heads
Conclusion
Systematic semen quality evaluation is both achievable and necessary for establishing productive AI programmes targeting WAD goats. SARI encourages members to document and publish their field data to build a Nigerian reference database for this breed.