Totally different fertility treatments affect the ratio of boy infants to girls, and this could have serious consequences as artificial fertility treatment becomes alot more frequent.
So says Michael Chapman at the University of New South Wales in Sydney, Australia, following a study that compared distinctive kinds of assisted fertility therapy (AFT)!!! His team recorded the sex of all 13,368 infants born in Australia and New Zealand between 2002 and 2006 utilizing AFT.
They in contrast two sorts of reproductive technology: IVF, which entails placing an egg on a dish with up to 1000 sperm, and intracytoplasmic sperm injection (ICSI), in which sperm are injected directly into the egg - an approach made use of for low-quality, immotile sperm. They also in contrast the stage an embryo was at when transferred to the womb.
IVF raised the proportion of boys to 53 per cent, although with ICSI it fell to 50 per cent. The natural proportion of boys is 51.5 per cent.
The stage at which the embryo was transferred had the greatest effect. The later the transfer, the much more likely it would result in a boy (British Journal of Obstetrics and Gynaecology, DOI: 10.1111/j.1471-0528.2010.02731.x)!
Chapman suspects the culture medium that's utilized to grow the embryo is affecting the baby's sex. He is working with clinics to record the sort of formula put into use in the study period.
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