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If you are seeking a man who will give you a big family, first make sure you count how many brothers he has. The greater the number of male siblings your husband has, the more fertile he is likely to be, scientists say. They have discovered that men with mostly brothers are likely to be more productive.
The findings, published in the Asian Journal of Andrology, also support the theory that parents with genes for good male fertility are more likely to have boys. Normally, in Britain 105 boys are born for every 100 girls.
Men have a better chance of having children if they have semen teeming with strong-swimmers. Now fertility experts say they have found a good indicator of what makes sperm good movers in the first place. A study from Brown University in Rhode Island, found sperm that had tails of a similar length were better able to travel than those with tails of varying lengths.
Male fertility under threat as sperm counts drop within past two decades. A comprehensive study into the reproductive health of 26,600 men found sperm concentration has decreased by a third since the 1990s. The findings are so significant experts have warned action must now be taken to avoid significant fertility problems and the average family size decreasing.
UK study has shown that men with unhealthy lifestyles produce as much swimming sperm as those living more sensibly. But those who wore tight underwear instead of loose boxer shorts and did manual work had lower sperm counts.
Under current guidelines, GPs are supposed to warn men diagnosed with infertility of the dangers of alcohol, tobacco and recreational drugs. Infertile men are also urged to avoid being overweight. In some cases, fertility treatment is delayed to allow couples time to improve their lifestyles.
Scientists are now using the compounds to develop a new gel they hope will increase the chance of couples conceiving naturally without the need for expensive treatments such as IVF.
Male fertility has been largely overlooked until recently with most treatments requiring women to take medication or undergo expensive and invasive procedures. Up to half of the problems suffered by couples trying to conceive, however, are due to the man's fertility.
Most men don’t give much thought to their prenatal care, but, according to male-fertility experts, what guys do now could make the difference between becoming a dad or not.
Unlike women -- who have all the eggs they will ever have when they’re born -- men produce sperm all day long. Sperm takes about two to three months to fully mature, so a guy’s behaviour during the past 90 days will affect the baby he makes today, or whether he can make one at all, said Dr. Sijo Parekattil, director of urology at Winter Haven Hospital, where he specializes in male infertility.
Up to a quarter of men around the world have a genetic defect that could reduce their chances of having children. Scientists have found some sperm lacks a protective protein that helps it to reach the egg.
The protein, DEFB126, coats the sperm and allows it to penetrate mucus in the female reproductive tract. It also protects the sperm from attack by the female immune system.
Without it, researchers believe it takes longer for a man with this defect to make his partner pregnant.