The
most female
Watch in the
world
1888
Discovery of the chromosomes as carriers of the genes, and of the fact
of gender decision through the two types of spermatozoa in the male
semen which are reproduced in equal quantities. With this discovery
it becomes even stranger to see that more boys than girls are being
born. Obviously this is not purely coincidental and we may suppose that
the underlying factors may one day be used in actual gender planning
for the conception of a selected gender.
1930
The Austrian scientist Knaus and the Japanese Ogino discover the high
incidence of regularity of 15 days between the ovulation day and the
next menstruation, as well as the lifespan of the spermatozoa of two
to three days after ejaculation.
1960
The US professor Dr. Shettles enlarges the long known hypothesis that
male-conceiving sperms proceed faster to the ovum than the female-conceiving
ones by the assumption that the latter retain their fertilizing capacity
longer than the former. This would mean that on the day of ovulation
a boy would be procreated because the faster Y-sperms win the race to
the ovum, but that two days before ovulation only a girl can be procreated
because only the longer living X-sperms can wait long enough for the
ovum.
1964
The German Academy for Population Science publishes the thesis by Dr.
Otfried Hatzold ((The Gender Proportion in Newborns and its Variation
as a Preconceptional Probability)}, in which he develops a theory, based
on the Shettles-findings, for the explanation of the higher male birth
rate and its varying importance. The gender proportions in births therefore
is the statistical proof for the Shettles-hypothesis.
1970
Shettles publishes a guide for gender planning in his book "(Your
Baby's Sex: Now You May Choose". He recommends to determine by
temperature taking the ovulation day for a boy and the second day before
the ovulation day for a girl; and since he knows that this is hardly
feasible, he recommends as secondary barrier a chemical change in the
vagina by means of a douche with a sodium or vinegar solution prior
to the act.
Hatzold had the idea for a statistical approach to the problem. His
thesis: If the cycle length is recorded over a period of at least six
cycles it will be possible to predetermine the earliest and the latest
date of ovulation. Based on this and the existing knowledge it was possible
to devise a fully natural method of gender planning with a high success
rate. He published his book "Desired child: boy or girl"(in
German only) wherein he recommends for the first time his genial idea:
For a girl, the day of conception should be based on the shortest cycle
length, and for a boy on the longest cycle length. This permits to either
find the specific day of conception, or the pregnancy is not achieved
at all during that particular cycle.
1973
Hatzold's reflections were so sensational that the German Science Foundation
decided to verify them with a representative study under the direction
of Dr. Hatzold. The result proved
a high success rate when correctly applied. However, it was also found
that the calculation
of the days was too difficult for the majority of the couples in the
panel.
1979
Hatzold develops a sliding calendar with which it is sufficient to cross
the dates of the menstruation in order to read all days relevant for
family planning without further calculation and risks of calculation
errors. Random checks among users of the calendar within the framework
of the research project "Gender planning" indicate that the
gender planning method has a success rate of more than 90 % while the
extended time selection method reduces the risk factor in natural contraception
to about 5 % as opposed to the 15-20 % risk in the well-known Ogino-Knaus
method.
1984
Publication of Dr. Hatzold's research report "Gender planning"
(in German only) which confirms the above results.
1985
The U.S. Doctor Ron Ericsson has developed a test tube method for sex
choice. This is a lab proof for Dr. Shettles hypothesis that male-conceiving
sperms proceed faster to the ovum than the female-conceiving ones.
1990
Dr. Hatzold's reflections are the determining factor for the development
of the SWISS LADY WATCH. It is the one who adds "the last screw"
to a so far unusable instrument.
The American Physician Ron Ericsson has developed an in vitro method for gender choice.
The spermatozoa is added
to a test tube containing various solutions. "Boy" sperms
are fighting their way fast to the bottom and away from the "Girl"
sperms. The physician takes out the sperms of the 
desired gender and introduces them into the mother-to-be.
Professor Karl-Heinz Broer, Cologne, Germany, says he is using the procedure only in rare special cases. For instance when a boy may not be conceived due to the bleeding disease which is inherent in a family and which only touches boys. In such a case gender choice is lifesaving.
The separation of the
"boy" and "girl " sperms made in the test tube as
follows:
The spermatozoa are moving from a base solution (1) to various separating
solutions (2) (3) (4). Boy sperms (blue) move fastest to the bottom.
Girl sperms (pink) remain above even though they have the heavier specific
weight.
Dr. Otfried Hatzold, Munich,
Germany
For more specific scientific information click here.
How is natural
family planning possible?
Various laws of nature relating to the male and female body mean that
an unplanned pregnancy can be avoided or the actual sex of a planned
child can be decided by restricting sexual intercourse to certain days
in the menstrual cycle.
An egg becomes available
for fertilization only once in each menstrual cycle and with great regularity:
15 days before the start of the next period menstrual
bleeding.
- An egg can only be fertilized within a few hours of ovulation, which
is when it leaves the ovary.
- The man's semen remains capable of fertilization in the woman's body
for about two days, or three days in exceptional cases.
The sex of the child depends on the father's semen. The woman's egg
has no gender but there are two types of sperm:
Those which contain an X-chromosome and those with a Y-chromosome.
The female sperm (with the X-chromosome) moves more slowly but remains
capable of fertilization for longer, whereas the male sperm with a Y-chromosome
is more active and moves more quickly, but does not live as long.
Natural family and gender planning can be based on these scientific
facts. If a couple makes sure that no semen enters the woman's body
three days before ovulation at the latest and not until two days after
ovulation at the earliest, this means there are no sperm cells present
during the fertile phase of the egg which could bring about conception.
This is how an unwanted pregnancy can be avoided. If, however, sexual
intercourse takes place exactly two days before ovulation, only the
long-lived female-type sperms are able to wait long enough for the egg
and produce a baby girl. By contrast, intercourse on the actual day
of ovulation will produce a boy because the faster male-type sperm cells
reach the egg before the slower female cells. This means that for a
girl, no unprotected intercourse should take place after the ideal conception
day and for a boy before the ideal conception day.
Method
In order to devise a practical family planning method with this information,
it is necessary to find out when ovulation takes place. Unfortunately
there is still no method available for doing this. There are various
pointers to ovulation, such as morning temperature measurements, inspection
of the cervical mucus and mittelschmerz (inter menstrual pain), but,
together with the modern ultrasound technique, these merely provide
reliable evidence that ovulation has just taken place or is taking place.
With a bit of luck it is still possible to conceive a son, but to plan
a daughter or to prevent pregnancy a woman needs to know a few days
beforehand when ovulation will take place.
The gynecologists Knaus and Ogino devised the following solution: The
only reliable information we can ever have about ovulation is retrospective,
i.e. the 15th day before the first day of the next period. If a note
is kept of the first day of each period for a year, it is possible to
work out the earliest and latest days on which ovulation takes place
after the start of a period. If the difference between the earliest
possible and latest possible ovulation does not exceed a 10 days and
if there are no unusual circumstances affecting the woman's wellbeing,
ovulation in the future may reliably be expected to take place within
those limits.
Contraception
For natural contraception, intercourse should not take place from 3
days before the earliest possible ovulation time to 1 day after the
latest possible ovulation time. This method is as safe as any other
if the days are worked out correctly and an extra day is added on to
the fertile time as a safety margin.
This "safety day" is incorporated into the SWISS LADY WATCH.
If the timing method is combined with another preventive method to safeguard
against any exceptional circumstances, the same degree of safety as
with the pill can be achieved.
Gender planning
In order to produce a daughter, intercourse must take place two days
before the earliest possible ovulation time. This becomes the specific
conception day for a girl or. If the cycle is longer than the shortest
one measured, there will be no pregnancy during that cycle.
- In order to produce a son, intercourse must take place on the exact
day of the latest possible ovulation time. This is the specific conception
day for a boy or, if the cycle is shorter than the longest one recorded,
there will be no pregnancy in that cycle.
The SWISS LADY WATCH
makes use of these facts.
A research project by the German Research Association, under my supervision
and concerning the opportunities and effects of natural gender planning,
revealed that success rates of over 90% could be achieved by correct
use of the method described. It was found, however, that the calculations
previously required to work out the crucial days in the cycle were extremely
difficult and the users of the method frequently made mistakes. This
is why a fairly high failure rate has been attributed to the timing
method of contraception, known as the Knaus-Ogino method. This is hardly
surprising, given that Professor Knaus himself published calculation
errors in his guide to the method, which went unnoticed by the scientific
world for 30 years and are still being made by experts.
Possible problems
If you have noted the dates of your past menstrual cycles when not on
the pill, you can start using the SWISS LADY WATCH straight away for
family planning, although you must be sure of the length of your cycle.
You need to be specially careful because there is a risk of carrying
over past errors in your calculations. The length of a menstrual cycle
is the difference between the first day of two consecutive cycles, but
the last day of the old cycle is also the first day of the new one.
This is why the number of days in the cycle must be 1 higher than
the length of the cycle. Example: Period starts on 2 March, the next
on 30 March. The cycle length is therefore 28 days (30 minus 2 = 28)
but 30 March is the 29th day of the old cycle.
The SWISS LADY WATCH
cuts out calculation errors because you only have to read and note down
or act according to the positions of the red dot.
You just have to remember that, based on your knowledge of the length
of your menstrual cycles, the dot position on the SWISS LADY WATCH is
always 1 higher than the basic cycle length.
However it is not advisable to use the method if the difference between
your shortest and longest cycles is more than 10 days.
Dr. Otfried Hatzold