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Effects of water-soluble Laminaria japonica polysaccharide 3 (LJP-P3) on bull cryopreservation sperm.
Cryobiology 2017 December
In this study, water-soluble Laminaria japonica polysaccharide3 (LJP-P3) was investigated for the cryoprotective effects on bull sperm. Five concentrations of LJP-P3 with 0.1, 1, 10, 50 and 100 mmol/L were added into the extenders of bull semen, respectively, and the effects on quality of sperm after freezing-thawing were assessed. The results showed that the kinematic parameters of bull sperm including linear motile sperm (LM), curvilinear line velocity (VCL) value, straight line velocity (VSL) and velocity of the average path (VAP) were greater in the extenders containing LJP-P3 (P<0.05). In comparison to those of other treatments and control group the extenders containing 1.0, 10.0 and 50.0 mmol/L of LJP-P3 led to higher percentage of mitochondrial activity and sperm membrane integrity(P<0.05), and the acrosome integrity of bull cryopreservation sperm were significantly improved in all treatment groups. Moreover, the higher GSH-Px, SOD and CAT levels in bull cryopreservation sperm were favored from the extenders of 10.0, 50.0 and 100.0 mmol/L LJP-P3 added (P<0.05) compared with other treatments and control group. In addition, the results of artificial insemination showed that both the pregnancy rate and the number of calving were higher in the group of semen containing 10 mmol/L of LJP-P3 than that of control group (P <0.05). In summary, LJP-P3 exhibited a greater cryoprotective effect to bull sperm and the most suitable concentration of LJP-P3 is 10.0 mmol/L.
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