Are changing semen parameters a universal phenomenon?
The semen characteristics of 100 fertile indigenous blacks were studied. The mean semen volume was 2.6 ml, sperm density 55 million/ml, motility 61% and well-formed sperm 71%. These figures are comparable to those of similar recent studies in Caucasians but differ significantly from earlier studies. Our data seem to support recent observations that there has been a decline in the sperm density of fertile males in the past 3 decades and that the earlier standards of sperm concentration may be too high for the present.
D N
DN
Osegbe
E O
EO
Amaku
S N
SN
Nnatu
D000328:Adult; D001741:Black or African American; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012661:Semen / Q000032:analysis*; D013076:Sperm Count; D013081:Sperm Motility; D013094:Spermatozoa / Q000166:cytology