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Effect of egg yolk and other reagents upon the zinc of cold-shocked boar spermatozoa

Summary. A marked reduction (80·8%) in the zinc uptake by boar spermatozoa cooled to 4°C occurs when the seminal plasma is pretreated with egg yolk–glucose at this temperature. Crude lecithin is less effective (59·8%). Similar pretreatment of the seminal plasma by the polycationic drug Antrypol, which totally removes the zinc-precipitable basic haemagglutinin, does not result in a significant reduction of the sperm zinc uptake at 4°C.