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The first fraction of ejaculate is the most effective for conception -- ScienceDaily

In the first systematic review and meta-analysis of trends in sperm count, researchers from the Hebrew University-Hadassah Braun School of Public Health and Community Medicine and the Icahn School of Medicine at Mount Sinai report a significant decline in sperm concentration and total sperm count among men from Western countries. By screening 7, studies and conducting a meta-regression analysis on studies between and , the researchers found a In contrast, no significant decline was seen in South America, Asia and Africa, where far fewer studies have been conducted. The study also indicates the rate of decline among Western men is not decreasing: the slope was steep and significant even when analysis was restricted to studies with sample collection between and The research was led by Dr. While declines in sperm count have been reported since , the question has remained controversial because of limitations in past studies.
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Comprehensive study shows a significant ongoing decline in sperm counts of Western men

School of Medicine. Sperm may be too few in number, move too slowly, or be structurally abnormal, or their passage out of the body may be blocked or disrupted. Clomiphene , a fertility drug, may increase the number of sperm, but assisted reproductive techniques may be needed. See also Overview of Infertility.
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Sperm is the male reproductive cell. In the types of sexual reproduction known as anisogamy and its subtype oogamy , there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon , whereas a non-motile sperm cell is referred to as a spermatium.
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