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  • Title: Effect of dietary vitamin E and selenium supplementation on semen quality in Cairn Terriers with normospermia.
    Author: Kirchhoff KT, Failing K, Goericke-Pesch S.
    Journal: Reprod Domest Anim; 2017 Dec; 52(6):945-952. PubMed ID: 28581128.
    Abstract:
    Among others, selenium (Se) and vitamin E (VitE) have been provided to dogs to improve semen quality. However, scientific evidence documenting an effect in dogs is lacking. The aim of this study was to investigate the effect of supplementation of these antioxidants on various ejaculate parameters in a randomized, double-blinded trial using Cairn Terrier males exhibiting normal seminal quality parameters. Three dogs each were fed a standardized diet and supplemented with 0.1 mg Se, 100 mg VitE or 0.1 mg Se + 100 mg VitE/dog for 3 months. Ejaculate analyses (volume, progressive motility, vitality, morphology, concentration) were performed before inclusion (D0) and after 1, 2 and 3 months (+1, +2, +3). At the same time, glutathione peroxidase (GSH-PX) and VitE in seminal plasma (SP) and GSH-PX in blood samples were determined. Vitamin E levels in SP were below the detection limit (1.0 mg/L) in all samples. GSH-PX in blood (164.0-2794.4 IU/L) and SP (18.4-4326.0 IU/L) was highly variable. Supplementation only significantly affected the total percentage of sperm head abnormalities (p = .011). Time significantly affected the percentage of morphologically abnormal sperm (p = .025), sperm head abnormalities (p = .007), proximal droplets (p = .001) and GSH-PX in SP (p = .015). Additionally, a significant interaction between time and group was identified for the percentage of membrane-intact sperm (p = .048), head abnormalities (p = .018), acrosomal defects (p = .043) and proximal droplets (p = .002). Although some effects could be identified for selected parameters, we failed to identify a clear trend about how a 3 months VitE and/or Se supplementation affects semen parameters in normospermic Cairn Terriers.
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