Abstract
Extensive analysis of the ram seminal plasma proteome reveals a complex and diverse protein composition. This composition varies between males with different sperm preservation abilities. Several proteins were shown to originate from the spermatozoa and positively correlate with sperm liquid preservation, indicating that these proteins can be traced as sperm biomarkers within the seminal plasma. The zinc alpha-2 glycoprotein (ZAG) was found to have a biphasic effect on sperm mobility, with a short-term stimulation followed by a long-term exhaustion of sperm mobility after a 24h preservation period.
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