38217RE: [FH] Re: Breeders Perspective
- Dec 8, 2009Hi Susan,
Every kitty born from an HCM parent has a 50% chance of inheriting the
disease. Sex does not matter, although it is said that males typically
develop the disease faster than females. I know there are exceptions to
this rule though. My Vizzy was diagnosed with RCM at age 10. He has a
sister who died of HCM (sudden death - the owners were not aware she had it)
at age 5. Their mother was not diagnosed with HCM until she was 10 years
old, and a half-sister (same mother, different father, was diagnosed with
mild HCM at 1.5 years). That is what makes HCM so challenging for breeders.
Even for those who do screen for HCM, a normal screen does not guarantee
that their cats do not have the disease. Unfortunately, a lot of breeders
only do an echocardiogram once on their breeding cats, and then they think
they are in the clear, which is not the case. I have been breeding
Norwegian Forest Cats for 10 years now, and I do my best to scan my breeding
cats every 1-2 years. I lived in Tucson, AZ for six years, and there were
no cardiologists in the area. We just recently moved to Cedar Rapids, Iowa.
I haven't checked to see if there are cardiologists locally, but I know the
vet school in Ames has some very good ones.
From: firstname.lastname@example.org [mailto:email@example.com] On
Behalf Of dshale1
Sent: Tuesday, December 08, 2009 12:12 AM
Subject: [FH] Re: Breeders Perspective
When Pye was diagnosed with very mild HCM 2.5 years ago at age 9, we told
the breeder (Pye is a British shorthair). She said she had only heard of one
other case of HCM in the breeding lines she is involved with and it wasn't
one of her own cats. She did say she knew there had been a case of HCM in on
Pye's mother's side. To her knowledge none of Pye's littermates have been
diagnosed with HCM to date, and I've always wondered why Pye had it and not
her brother because I thought males were more susceptible.
It seems to me that when a breed doesn't tend to develop HCM until they are
much older, as seems to be the case with British shorthairs, by the time
they are diagnosed they have been long retired from breeding, but have
already passed on their genes. I am not sure it has been demonstrated that
when cats develop HCM later in life it is due to a genetic propensity--is
--- In firstname.lastname@example.org, "gaileder" <greder@...> wrote:
> I am a New Zealand breeder of siamese and orientals. I have just found out
that some of the cats I breed have developed HCM so I have had to terminate
my breeding activities.
> I have a question:
> How many of you with pedigree cats which have developed this problem have
told the breeder of your cat.
> I have come to realise how important this is because if the breeders are
not told there is a problem they will keep using the same lines.
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