Abstract
To improve the results obtained with a reference cryopreservation extender (control extender: Triladyl + 20% (v/v) egg yolk + 6.4% (v/v) glycerol) for freezing caprine semen, glutamine was added to 18 split ejaculates at concentrations of 0, 20, 40, 80 and 120 mM (experiment 1). In experiment 2, glutamine was added to 18 split ejaculates at concentrations of 20, 25, 30, 35 and 40 mM. In the third experiment, the egg yolk was replaced with the low-density lipoprotein (LDL) fraction of egg yolk. The quality of frozen then thawed spermatozoa in each extender was compared using computer-assisted semen analysis. In experiment 1, glutamine at concentrations of 20 mm and 40 mm significantly improved sperm motility compared with the control extender. However, at 120 mM, a significant decrease in motility and velocity was observed. In experiment 2, motility, curvilinear velocity and amplitude of lateral head displacement (ALH) were improved in glutamine at 25 mM compared with the control. In experiment 3, 8% LDL and 25 mM glutamine significantly improved sperm motility, straight line velocity and ALH. In the fourth experiment, the quality of the previously defined freezing extender (Triladyl + 8% (v/v) LDL + 25 mM glutamine + 6.4% (v/v)...Continue Reading
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