Coital timing relative to ovulation for gender selection
Dear Abubakar,
in my opinion this method of sex determination is unsupported by evidence and inoperative.
Best regards
dear friend,
There’s the un relabel method, based on the that male Y-sperms are faster swimmers than X-sperms, due to Y sperm carrying less DNA than X sperm ,but it does not live so long.Therefore, if a women wants a boy, then, she should try to have sex as close as time of ovulation, to give the male Y sperm a chance to reach ova and penetrate it to form zygote . if she wants a girl, she should have sex two to four days before ovulation to be sure the all Y sperms die ,before the ova reach the fertilization site .
Dear colleague
I agree with Dr Travik - there are no evidences that the moment of the coitus may determine the fetal sex. There are some older study related to maximum fertile days (e.g. Gray RH et al. Hum Reprod. 1998 May;13(5):1397), and they did not find a significant relationship between the timing of the coitus related to the ovulation ay and the sex of the baby.
Thanks Dr Mohammed your input is quite helpful. Most people have same belief regarding X and Y carrying sperm.
Thanks Dr Travis. I agree with you that there is no evidence but some still think it is possible.
Dr Hual Feng can you pls share some small information regarding selecting high Y sperm however I think this can only happen with ART
A comment to Dr Al-Diwan's thoughts. In my work as an 0/G (35 years)I have met some women who wanted girls, since their siblings only had boys. They had been told by "old folks" to have sex 3-4 days before ovulation. They all succeeded in delivering girls - on of them three in a row! Its an interesting theory.....
Dear colleague, since your question was "how accurate," I can answer without the slightest hint of doubt, that you have a 50% of chance of getting the selected sex in the offspring.
Precisely:
If the ejaculation occurs within 4-6 hours from the time of onset of ovulation so the sex of fetus will be male. If the ejaculation will be done 8-10 hours before the time of ovulation so the sex of fetus will be female. that all ..Good luck "AKA"
Thank you all for your valuable comments and contributions. They are quite helpful in solving the ridle.
Well, that was an interesting debate. Personally, I'm pleased have past the age where I have to think about my ovulation!
In order to clarify the point, there is insufficient scientific evidence to indicate that the time of insemination with respect to ovulation is a determining factor with respect to the sex of the offspring. The analysis of this fact must be done from a population study, and in this case, as indicated by Dr. Tollan, the most likely result is 48% females / 52% males. Nevertheless this value could be modified according to the diverse species studied, but all go around 50%. There are in the bibliography several works, published time to time, that show a shift of those values in some particular case, but they have been sporadic and unrepeatable. Two more things to consider: on one hand, to interpret that there has been an expected value shift, the result must be run beyond two sigma of the population average; and secondly, to understand that in many species there are ovulatory waves, which is not consistent with the idea of insemination time, since ovulation in this case is not univocal. I hope it clarifies the subject. Greetings to all.
well,my dear collogues. i had publish paper at beginning of 90s, considering the sex determination in horses . Mare vagina pH media had been modified by washing it by phosphate buffer with different pH values ..the study showed that the neutral vagina media ( 7 to 7.5 ) led to mostly males,whereas vagina with 6 to 6.5 pH values was led to female offsprings..No pregnancies were occur when the vagina washed with alkaline pH phosphate buffer ( 8.5)
Dr Mohammed Al-Divan it will be intresting to observe this findings of yours in humans. Thanks.
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