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    Título
    Post-thawing quality and incubation resilience of cryopreserved ram spermatozoa are affected by antioxidant supplementation and choice of extender
    Autor
    Mata Campuzano, María
    Álvarez Rodríguez, Manuel
    Álvarez García, MercedesAutoridad BuleriaORCID
    Tamayo Canul, Julio Renan
    Anel Rodríguez, LuisAutoridad BuleriaORCID
    Paz Cabello, Paulino deAutoridad BuleriaORCID
    Martínez Pastor, FelipeAutoridad BuleriaORCID
    Facultad/Centro
    Facultad de Ciencias Biologicas y Ambientales
    Área de conocimiento
    Biologia Celular
    Datos de la obra
    Theriogenology, 2015, vol. 83, n. 4
    Editor
    Elsevier
    Fecha
    2015-03-01
    Abstract
    The performance of cryopreserved semen in ovine artificial insemination still needs improvement. Some antioxidants have been tested, with variable success. We cryopreserved semen from Churra rams using TES-Tris-fructose with 4% glycerol and 10% egg yolk (EY) or 3.5% soybean lecithin (SL), with 1 mM of reduced glutathione (GSH), Trolox, crocin, or cysteamine. Samples were analyzed after thawing and incubation (6 hours, 38 °C) for motility (computer-assisted sperm analysis [CASA]), viability, acrosomal integrity, apoptosis, mitochondrial activity, chromatin status, and lipoperoxidation (malondialdehyde production). Interactions (antioxidant/extender/incubation) were significant for most variables. Extenders yielded similar results, although SL depressed mitochondrial activity and linearity (P < 0.001), it improved motility (P < 0.05), DNA fragmentation (P < 0.05), and acrosomal damage (P < 0.001). The control, GSH, and Trolox showed greater viability with SL (P < 0.01). Cysteamine depressed motility (0 hours: 51.6 ± 2.0% vs. 32.3 ± 4.3%; 6 hours: no motility vs. 32.5 ± 1.9%; P < 0.001), but improved viability when using EY (P = 0.004). Crocin increased acrosomal damage (P = 0.022) but improved linearity-related parameters after thawing (P = 0.014). Trolox considerably reduced malondialdehyde production in both extenders (8.6 ± 0.4 nmol per 108 cells vs. 14.2 ± 0.3 in EY and 20 ± 0.6 in SL; P < 0.001). Interestingly, thiol antioxidants (cysteamine and GSH) increased DNA fragmentation (percentage of DNA fragmentation index), whereas crocin reduced it (P < 0.05). Interactions between extender and antioxidant must be taken into account for improving sperm cryopreservation. Soybean lecithin seems to be a suitable replacement for EY, but its effect on mitochondria must be investigated. Trolox and crocin might be useful for ram semen freezing.
    Materia
    Veterinaria
    Palabras clave
    Ram
    Spermatozoa
    Antioxidant
    Cryopreservation
    Extender
    Peer review
    SI
    URI
    http://hdl.handle.net/10612/10700
    Versión del editor
    https://www.sciencedirect.com/science/article/pii/S0093691X14005706
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