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Effect of Maca aqueous extract addition to a freezing extender for canine semen

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Abstract

This study investigated the effect of the addition of Lepidium meyenii (Maca) to the freezing extender on the post-thaw quality of dog semen. Ten canine ejaculates were frozen following a two-step protocol using a tris-glucose-citrate egg yolk extender with or without the addition of 10 µl/mL of aqueous extract of Maca (Maca and ctrl groups, respectively). Prior to (fresh semen) and after freezing (T0) sperm motility, kinetic parameters, viability and mitochondrial membrane potential (MMP), as well as the levels of malondialdehyde (MDA) were evaluated. In addition, sperm motility, kinetic parameters, viability and MMP were examined up to 2 h of incubation of 37 °C after thawing (T1 and T2) to evaluate thermo-resistance. The addition of Maca reduced MDA concentration at T0 (p < 0.05) and increased total motility, the percentage of sperm with medium velocity and WOB at T1. Progressive motility decreased (p < 0.05) at T1 in the ctrl group, whereas it was not affected in Maca group at any time point. In addition, the percentage of hyperactivated spermatozoa remained constant at T1 in the ctrl, while in the Maca group an increase (p < 0.05) of this parameter was recorded. Although no differences were found for MMP between groups at any time points, a decrease of viable sperm with low MMP was observed in ctrl group between T0 and T1 and in Maca group between T1 and T2. The addition of Maca prior freezing reduced the extent of lipid peroxidation and activated canine sperm motility and hyperactivation after thawing.

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Acknowledgements

The authors would like to express their gratitude to all of students and junior staff of the Department of Veterinary Medicine and Animal Productions at the University of Naples Federico II, as well as the staff at the FOOF breeder center (Caserta, Italy) for their assistance with the semen collection and animal management.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Contributions

NC, BM, CDP: conceptualization and methodology; CDP, AC, SS, EI, RC, SD, EG and FL: investigation and data curation. CDP: statistical analysis and writing; NC, BM and BG: review, supervision and visualization; AC: editing of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Alfonso Calabria.

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Ethics approval

All procedures were carried out in compliance with the code of ethics (D.lgs. 26 − 04/03/2014) and were approved by the Ethics Committee of the Department of Veterinary Medicine and Animal Productions at the University of Naples Federico II, Italy (prot. no. PG/2021/0057934 of 07/06/2021).

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A written inform consent was signed by the legal representative of the breeding center.

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Not applicable.

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The authors declare no competing interests.

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Cocchia, N., Merlo, B., Calabria, A. et al. Effect of Maca aqueous extract addition to a freezing extender for canine semen. Vet Res Commun 48, 301–307 (2024). https://doi.org/10.1007/s11259-023-10163-5

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  • DOI: https://doi.org/10.1007/s11259-023-10163-5

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