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ISOELECTRIC FOCUSING OF BOAR SPERMATOZOA

Summary.: The isoelectric points of washed spermatozoa from intact boars and from boars after removal of the seminal vesicles were determined using isoelectric focusing on natural pH gradients. Normal boar spermatozoa focused at a higher pH than spermatozoa from boars without seminal vesicles. The isoelectric point of the latter was increased to a value approaching normal by preincubation in normal seminal plasma. This indicates that seminal plasma alters the membrane surface charge of boar spermatozoa on ejaculation.