Authors: Zampini Enzo German, Veiga Maria Fernanda, Fumuso Fernanda Gabriela, Cabido Luciana, Neild Deborah Margarita, Chaves Maria Graciela, Miragaya Marcelo Horacio, Trasorras Virginia Luz
Journal: Frontiers in veterinary science
Summary
# Editorial Summary Synchronising reproductive cycles in camelids presents practical challenges for embryo collection programmes, particularly in field settings where ultrasound facilities may be unavailable. German and colleagues tested a hormone-based protocol combining GnRH agonist, prostaglandin F2α, and equine chorionic gonadotrophin to synchronise and superstimulate eight female llamas for fixed-time natural mating without ultrasound guidance. The protocol achieved a 75% response rate with an average of 4±0.9 corpora lutea per donor and recovered 16 embryos across 24 ovulations (66.7% recovery rate); however, embryo quality was variable, with 56.2% of recoveries classified as transferable grade I embryos and 37.5% being non-viable arrested morulae. Transcervical transfer of the 10 grade I–II embryos into synchronised recipients resulted in a 50% pregnancy rate at day 24 post-transfer. For practitioners managing camelid breeding programmes, this approach offers a pragmatic alternative to ultrasound-dependent protocols, though the relatively high proportion of poor-quality embryos and moderate pregnancy rates suggest further refinement may be needed to optimise embryo viability and transfer success in llama embryo production systems.
Read the full abstract on PubMed
Practical Takeaways
- •This protocol enables field-based embryo collection in llamas without ultrasonography, using GnRH, PGF2α and eCG with timed matings
- •Expect approximately 2-3 transferable embryos per donor female using this approach, with moderate pregnancy success rates
- •The method could be practical for llama breeding programs with limited access to ultrasound technology, though outcomes require validation in larger populations
Key Findings
- •75% of llama embryo donors (6/8) responded to GnRH-PGF2α superstimulation protocol with mean of 4±0.9 corpus lutea per female
- •Embryo recovery rate was 66.7% (16/24 CLs) with mean 2.7±1.5 embryos per female; 56.2% were grade I quality
- •50% pregnancy rate (5/10) achieved 24 days post-transfer of grade I and II embryos into synchronized recipients