Is there really a decrease in sperm parameters among healthy young men? A survey of sperm donations during 15 years

Evaluation of semen parameters in semen donors in a ten-year period in the city of São Paulo

“…These findings confirmed other studies that had shown a decrease in the seminal quality over time in many regions of the world (3,5,9,16) . However, this finding has not been universal and has presented a large geographic variation (9) .…”

Pesticide Exposure and Health Related Issues in Male and Female Reproductive System

“…Studies from Italy, Denmark, Canada, Tunisia, India, Poland, Israel, Scotland, Greece and Germany suggest that there has been a decline, or sperm parameters are impaired in young populations (Adamopoulos et al, 1996;Younglai et al, 1998;Bilotta et al, 1999;Almagor et al, 2003;Vicari et al, 2003;Jørgensen et al, 2006;Sripada et al, 2007;Adiga et al, 2008;Paasch et al, 2008;Horak et al, 2008;Feki et al, 2009). Conversely, other reports from US, Japan, Korea, Sweden, Spain, Israel and Czech Republic showed no significant evidence of deterioration in sperm quality (Fisch et al, 1996;Paulsen et al, 1996;Benshushan et al, 1997;Berling & Wölner-Hanssen, 1997;Andolz et al, 1999;Seo et al, 2000;Itoh et al, 2001;Zvĕrina et al, 2002). The materials and methods of the studies mentioned varied widely, as well as time period (one, two, or more decades), population sample (e.g.…”

Semen quality and age-specific changes: a study between two decades on 3,729 male partners of couples with normal sperm count and attending an andrology laboratory for infertility-related problems in an Indian city

“…However, there are also reports denying this decline in some major studies conducted throughout the world (10)(11)(12)(13), and some others that even showed an increase in total motile sperm count (14). Becker and Berhane (15) conducted a meta-analysis of 61 sperm count studies.…”