January 30, 2013

Photo of the week: Microscopic evaluation of semen

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Photo submitter Christine Skelly writes, “A microscope is essential to evaluate semen quality. At magnifications of 100 to 430, one may estimate the percentage of sperm moving progressively forward (preferably at least 70%), the proportion of sperm with aberrant movements (preferably no more than 10%), and the proportion of sperm with abnormal morphology (preferably no more than 10%). A densitometer or a hemacytometer may be used to determine the concentration of sperm in the semen. Alternatively, an experienced person may estimate sperm concentration on the basis of previous experience.”

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This photo was taken at Michigan State University. The Animal Science Image Gallery features photos from research institutions around the world. Visit the gallery to view more photos or submit your own.