Effect of novel lyophilized extenders on stallion post-thaw sperm motility.
Authors: Nunes Márcio M, Gurgel João Rafael C, Munhoz Maria Luiza, de Giuli Valdemar, Carneiro Gustavo F, Miragaya Marcelo H, Gallelli M Florencia, Guimaraes José D
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Novel Lyophilized Extenders for Stallion Sperm Cryopreservation Room-temperature-stable extenders could substantially improve the logistics of equine breeding programmes, particularly for international semen distribution, prompting researchers to evaluate whether newly developed lyophilised formulations could match the performance of conventional frozen extenders. Semen from 28 stallions was cryopreserved using two commercial extenders and two experimental lyophilised products (STAR and MX3), paired with equilibration protocols of either 20 or 60 minutes, with post-thaw total motility assessed as the primary outcome measure. The lyophilised STAR extender significantly outperformed Botucrio (a commercial control), whilst equilibration duration produced no meaningful differences in motility across any extender tested; notably, 71% of ejaculates demonstrated optimal motility when combined with the lyophilised formulations and the shorter equilibration protocol. For practitioners engaged in stallion fertility management and breeding programmes reliant on frozen semen, these findings suggest that lyophilised extenders merit serious consideration as they maintain efficacy comparable to or better than conventional products whilst offering crucial advantages in storage stability and distribution at ambient temperature for at least twelve months. This development could particularly benefit international breeding operations and facilities with limited access to ultra-cold storage infrastructure.
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Practical Takeaways
- •Lyophilized extenders represent a viable alternative to traditional liquid freezing extenders for stallion semen preservation with superior logistical advantages
- •Shorter equilibration times (20 minutes) may optimize post-thaw motility when using lyophilized extenders, potentially streamlining breeding protocols
- •Room-temperature storage capability eliminates cold-chain requirements, reducing infrastructure costs and improving accessibility for breeding operations
Key Findings
- •Lyophilized extenders (STAR and MX3) maintained post-thaw total motility comparable to commercial extenders in stallion semen
- •STAR extender showed significantly greater total motility than Botucrio commercial extender (P ≤ 0.05)
- •Shorter equilibration period (CP1: 20 min) produced optimal results with lyophilized extenders in 20 of 28 ejaculates
- •Lyophilized extenders offer practical advantage of room-temperature storage and distribution for at least one year