Due to the concern caused by the low sperm count among younger Danish men, the Danish Ministries of Health and Environment have launched a surveillance programme which includes an annual examination of the semen quality in young Danes from the general population. The results, published in the journal Human Reproduction Update, showed a The researchers noted, however, that far fewer studies have been conducted in these regions. Both findings -- in a meta-analysis bringing together various studies -- pointed to a potential decline in male health and fertility. This suggests measures of sperm quality may reflect the impact of modern living on male health and act as a "canary in the coal mine" signaling broader health risks, they said. The former measures the concentration of semen in a man's ejaculation, while the latter is semen concentration multiplied by volume.
It seems reasonable also to consider widespread poor semen quality among men as a potential contributing factor to low fertility rates among teenagers.
Poor semen quality may contribute to recent decline in fertility rates.
Richard Sharpe at Edinburgh University added: Studies have reported declines in sperm count since the early s, but many of those have been questioned because they did not account for potentially major confounding factors such as age, sexual activity and the types of men involved. Daniel Brison, a specialist in embryology and stem cell biology at Britain's Manchester University, said the findings had "major implications not just for fertility but for male health and wider public health". It seems beyond doubt that the enormous social changes of our societies play the major role in this decline, but can it be attributed to changing social structures alone or is a reduced fecundity in the population also a factor? To address this we have focused on trends in teenage pregnancies which to a large extent are unplanned.