Men also reduce fertility after age 35

For a long time, everyone knows that a woman's chances of having a baby will decline gradually from the age of 35, but according to a new study by French scientists, men also decline fertility from that age.

Experts from the Eylau Laboratory (a fertility support center in Paris) conducted a large study with 21,239 men over the age of 35, applying intrauterine insemination, in then the semen is filtered to select sperm and pumped into the uterus.

The team looked at the number, motility and morphology of sperm of these people. At the same time, they also recorded wives' rates of conception, miscarriage and childbirth, to determine how the age of the husband influences conception. The results showed that at 35 years of age, male fertility decreased by 10%, and from the age of 40 and above, this decrease was up to 20.

Injured sperm in DNA can still progress into eggs, but often cannot be fertilized, or if fertilized, it is possible to miscarry later.(Photo: schoor-urology.blogspot.com)

Dr. Stephanie Belloc, the leader of the study, said that in the method of intrauterine insemination, injured sperm in DNA (usually in older men) can still advance into eggs, but often do not fertilize. can be used with eggs, or if fertilization is possible, miscarriage usually occurs later. In contrast, in vitro fertilization, the transparent membrane of the egg is an effective barrier to preventing the entry of injured sperm in DNA.

Dr. Belloc said: 'We believe that husbands over the age of 35 are more likely to conceive. This study shows for the first time that the father's age affects the outcome of intrauterine insemination. Therefore, age factor should be considered by both doctors and patients when implementing reproductive support measures. '

According to the research team, 'some previous studies have examined the relationship between DNA damage and the results of implantation in the uterus, but there is no clinical evidence. Now, through this study, we have identified the age of the father as an important factor in conception; Male fertility will decline from age 35 ".

The study was published on July 7 at the annual meeting of the European Society for Reproduction and Embryology, in Barcelona, ​​Spain.

Truc Thinh (Daily Express, Sydney Morning Herald)