You may have some misunderstandings. Currently, no country has explicitly banned the reproduction of the genetic disease 441 (also known as "cat-to-parent chromosome 4 segment 41"). In fact, this is not an accepted standard term either.
What is commonly referred to as "cat-borne 441" refers to a genetic disease, polycystic kidney disease (PKD), which is a common disease that affects the kidney function of cats. PKD is caused by mutations in a number of genes that may be passed from parent cats to their offspring. If two cats carrying a PKD gene mutation mate, their offspring will also carry the gene and be more likely to develop PKD.
Although there is no national law that explicitly prohibits the breeding of cats with PKD, breeders should conduct genetic testing of cats and take care to avoid mating between cats with the PKD gene. In addition, local animal protection organizations and cat associations also advocate controlling the number of cat breeding and encouraging adoption instead of purchasing to reduce the number of stray and homeless cats.
In short, PKD is a common hereditary disease in cats. Breeders should avoid breeding cats carrying the PKD gene to reduce the spread of the disease in the cat population.
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