Post-cooling semen processing and sperm re-suspension as an alternative method to circumvent poor semen cooling in stallions.

Autor: Segabinazzi L; Department of Veterinary Surgery and Animal Reproduction, School of Veterinary Medicine and Animal Science, FMVZ, Universidade Estadual Paulista 'Júlio de Mesquita Filho', UNESP, Botucatu, Brazil.; Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies., Carmo MT; Department of Veterinary Surgery and Animal Reproduction, School of Veterinary Medicine and Animal Science, FMVZ, Universidade Estadual Paulista 'Júlio de Mesquita Filho', UNESP, Botucatu, Brazil., Freitas-Dell'Aqua CP; Department of Veterinary Surgery and Animal Reproduction, School of Veterinary Medicine and Animal Science, FMVZ, Universidade Estadual Paulista 'Júlio de Mesquita Filho', UNESP, Botucatu, Brazil., Alvarenga MA; Department of Veterinary Surgery and Animal Reproduction, School of Veterinary Medicine and Animal Science, FMVZ, Universidade Estadual Paulista 'Júlio de Mesquita Filho', UNESP, Botucatu, Brazil., Papa FO; Department of Veterinary Surgery and Animal Reproduction, School of Veterinary Medicine and Animal Science, FMVZ, Universidade Estadual Paulista 'Júlio de Mesquita Filho', UNESP, Botucatu, Brazil., Canisso IF; Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, Illinois, USA.
Jazyk: angličtina
Zdroj: Equine veterinary journal [Equine Vet J] 2024 Jul; Vol. 56 (4), pp. 697-710. Date of Electronic Publication: 2024 Apr 03.
DOI: 10.1111/evj.14085
Abstrakt: Background: Artificial insemination with cooled-shipped semen is the primary method used in the equine breeding industry; yet, sperm quality and fertility can be suboptimal for some stallions when standard techniques are used. Therefore, there is a critical need to develop alternative approaches for these stallions.
Objective: To assess sperm quality parameters and fertility of cooled-stored stallion semen processed by SpermFilter® or centrifugation and resuspended in three extenders.
Study Design: Controlled and field study.
Methods: In Experiment 1, semen was collected from 21 stallions classified as having good ('Good-coolers', n = 8) or poor ('Bad-coolers', n = 13) semen cooling. The semen was extended at 30 million spermatozoa/mL in a skimmed milk-based (SM) diluent, and refrigerated for 24 h. Then, the cooled-stored semen was processed through SpermFilter® or centrifugation, and the resulting sperm pellets were resuspended in SM, SM containing pentoxifylline (SM-P), or an egg yolk-based (EY) extender. Unprocessed cooled-stored semen served as control. Sperm motility parameters, plasma membrane integrity (PMI), and mitochondrial membrane potential (HMMP) were assessed in cooled-semen pre- and post-processing. Experiment 2, cooled semen from 9 stallions classified as Bad-coolers was used to inseminate 18 embryo donor mares at 66 cycles (Unprocessed, n = 22; SpermFilter®/SM-P, n = 16; or SpermFilter®/EY, n = 28). Data were analysed with a mixed model and Tukey's as posthoc, and logistic regression.
Results: Processed semen resuspended in EY had superior sperm motility compared to unprocessed, SM and SM-P (p < 0.0001). Semen processed by SpermFilter® resuspended in SM-P was similar to EY (p > 0.05). Pellet resuspension with EY and SM-P improved the HMMP of Bad-cooler stallions (p = 0.0010). Semen processed by SpermFilter® had superior PMI to centrifuged semen (p < 0.0001). Mares inseminated with SpermFilter®/SM-P (50%, 8/16) or SpermFilter®/-EY (68%, 9/28) had higher pregnancy rates than mares bred with unprocessed semen (14%, 3/22) (p < 0.001).
Main Limitations: Low number of mares in the fertility trial.
Conclusion: Sperm quality and fertility of Bad-cooler stallions can be enhanced by SpermFilter® and pellet resuspension with either EY or SM-P.
(© 2024 EVJ Ltd.)
Databáze: MEDLINE
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