חודשי הקיץ יולי אוגוסט

אכן מאמרו של ד"ר לוויטס דן בשינויים במדדים של הזרע בין חודשי הקייץ לאביב ולחורף -בחודשי הקייץ המדדים של ספירת הזרע ,התנועתיות,והאיכות המורפולוגית משתנים לרעה ולכן הסיכוי בחודשים אלו להרות קטן,אם כי גם בחודשים אלו מתקבלים הריונות תקינים מאותם זרעים ברי הפוטנציאל ההפרייתי האאוי. להלן המאמר: Am J Obstet Gynecol. 2013 May;208(5):406.e1-6. doi: 10.1016/j.ajog.2013.02.010. Epub 2013 Feb 8. Seasonal variations of human sperm cells among 6455 semen samples: a plausible explanation of a seasonal birth pattern. Levitas E, Lunenfeld E, Weisz N, Friger M, Har-Vardi I. SourceFertility and IVF Unit, Department of Obstetrics and Gynecology, Soroka University Medical Center, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel. Abstract OBJECTIVE: To compare the different sperm parameters according to season of the year on sperm production day and the season 70 days prior (during spermatogenesis). STUDY DESIGN: Retrospective Andrology Laboratory data comparison. A total of 6455 consecutive semen samples were collected as part of the basic fertility evaluation of 6447 couples. According to sperm concentration, the samples were classified as Normozoospermic or Oligozoospermic and analyzed in relation to the season. RESULTS: The sperm concentration and percentage of fast motility showed a significant decrease from spring toward summer and fall (P < .001) with recovery noticed during the winter. As well, the highest percentage of normal sperm morphology was observed during the winter months. CONCLUSION: Seasonal sperm pattern seems to be a circannual-rhythmic phenomenon. The winter and spring semen patterns are compatible with increased fecundability and may be a plausible explanation of the peak number of deliveries during the fall. Copyright © 2013 Mosby, Inc. All rights reserved.