[Seasonal variation in sperm characteristics].
In all species, seasonal patterns in fertility are observed. In humans, seasonal variations of pregnancies are observed in spontaneous reproduction or in IVF. The most important factor seems to be sperm values and specially the morphology. Our study, on 188,075 cases (FIVNAT 1987-1995) shows significant variations of semen characteristics: we observe, in August, an improvement of sperm morphology.
Zerah
S
S
Centre AMP, Clinique de la Dhuys, Bagnolet.
de Mouzon
J
J
Pfeffer
J
J
Taar
J P
JP
D005260:Female; D005307:Fertilization in Vitro / Q000706:statistics & numerical data*; D005602:France; D006801:Humans; D008297:Male; D011247:Pregnancy; D011256:Pregnancy Outcome; D012042:Registries; D012621:Seasons; D012661:Semen / Q000737:chemistry*; D013076:Sperm Count; D013081:Sperm Motility