Inherited (genetic) aspects and environmental aspects I suspect you meant?
Not that many!
Cats make a good model here. They are subject to drugs and vaccines and stresses and toxins unsuited to their species and also fed nutritional horrors for their species, all the time, so they are really a messed up species. So much so that currently ten percent of them die annually from ONE disease that never existed before man imposed its toxins on them. And that's not their leading cause of death either, top is cancer and second is kidney disease. Thjis is one messed up species - messed up by man's idiocy.
But it makes them a good candidate for finding out how many generations it takes to get healthy kittens born.
It's also much easier to answer the question when the generation time is much shorter than ours and one is permitted to manipulate the entire life of the individuals involved, to be healthy.
I have done this with my and my clients cats for several decades.
After three generations of cats kept healthy and/or made healthy, you can predict there will be healthy ones born as the fourth generation.
Definitely impossible. It shocks cat owners but that is how it is. There are too many inherited miasms and other inherited problems (DNA as opposed to epigene issues) that do not emerge in one generation to be handled all at once.
The three generations of damage potential, also applies to inherited defects in major genes (as opposed to acquired epigene switch position issues which align IMO with miasms).
You need to selectively breed away from defective genes (a potential ethics issue in humans but not in cats) and can breed out a recessive gene in three generations. Dominant genes breed out in one. (People who say recessives are for ever, are not looking at ALL the offspring and are looking only at one direct line. You must include all siblings and their offrsping to achieve zero of the recessive gene in the 4th generation after three controlled generations). This too I have proved in practice with breeding out nasty genes in cats, including recessive ones.
(Before homeopathy, most of my work was in cat genetics.)
So three generations will be affected unavoidably by what they inherit, however well you handle them. Not all will be affected but some will, less in each generation depending what was there, and what was allowed to emerge and be handled along the way. The first generation all are going to be ill however well their parents were handled.
As you say we all do die. The cats I bred of 4, 5 or 6th generation also died. With two exceptions who died from commercial catfood contamination, they all got older and had less life force, and got slower, and one day, just stopped, gently. No chronic disease.
EVERY vaccinated cat died of chronic disease or inherited defect. NO exceptions.
My current cat was heavily vaccinated before I got her. She has no chance to avoid the problems by homeopathy.
Namaste,
Irene
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Irene de Villiers, B.Sc AASCA MCSSA D.I.Hom/D.Vet.Hom.
P.O. Box 4703 Spokane WA 99220.
www.Furryboots.info
(Info on Feline health, genetics, nutrition & homeopathy)
"Man who say it cannot be done should not interrupt one doing it."