COLUMBUS, Ohio — While many researchers generally credit the desire for smaller families for the decline in fertility rates in developing, low-income countries, new research suggests that prevention of unwanted births may actually be a larger fact…
With each passing year, semen quality in adult men declines, suggesting that age plays a greater role in male fertility rates than previously thought, according to a new study by researchers at the University of California, Berkeley, and Lawrence Livermore National Laboratory. The study, published Thursday, Feb. 6, in the journal Human Reproduction, suggests that even healthy men may become progressively less fertile as time goes by.