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Hi Everyone,


I would love to hear from you what % KIrlee-foundation and inbreeding you feel comforatable with.

Do you have positive and/or negative experiences with what percentage? (ranging between 10 -50 % inbreeding fi.)


I am expecially interested in people who have been breeding for 10+ years.

Any changes in health/temperament when comparing recently born Devons to older lines?


Thanks in advance!


Best wishes,

Marjan Boonen




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  • No thoughts, ideas anyone.


  • What an interesting topic Marjan - hopefully you will get some input from other breeders!
  • Hi Everyone,
    no thoughts anyone?

    It's funny, amongst Dutch Maine Coon breeders (of which I am one too) this topic is discussed regularly with vigour.
    Not so in the Devonworld I guess.
    May I say I find it a challenge to try and diminish both mentioned percentages via outcrossing, as these percentages are a killer for the breed in the longer run.
    Especially when linebreeding is used on top of that in an already highly inbred breed.!
    I feel the only thing we loose (temporarily) is looks, while there is so much to be gained; nothing ventured, nothing gained
    Here is an interesting shedule to mull over, written by Sarah Hartwell (Messybeast)




    (Mating of closely related individuals)

    Produces uniform or predictable offspring.
    Hidden (recessive) genes show up and can be eliminated.
    Individuals will "breed true" and are "pure."
    Doubles up good genes.
    Eliminates unwanted traits.

    Doubles up on faults and weaknesses.
    Progressive loss of vigor and immune response.
    Increased reproductive failures, fewer offspring.
    Emphasis on appearance means accidental loss of "good" genes for other attributes.
    Genetically impoverished individuals.

    (Mating of less closely related individuals)

    Avoid inbreeding of very closely-related cats, but cats are still "pure".
    Produces uniform or predictable offspring.
    Slows genetic impoverishment.

    Require excellent individuals.
    Does not halt genetic impoverishment, only slows it down.

    OUTCROSSING (Mating of unrelated individuals within the same breed)

    Brings in new qualities or reintroduces lost qualities.
    Increases vigor.
    Cats are still "pure".

    Less consistency and predictability of offspring.
    May have to breed out unwanted genes accidentally introduced at same time.
    May be hard to find individuals which are true outcrosses.

    HYBRIDIZATION (Mating of unrelated individuals of different breeds)

    Brings in new qualities or reintroduces lost qualities.
    Increases vigor, may improve immune system and reproductive capacity.
    Introduces totally new traits e.g. color. Fur type.
    May result in new breeds.
    The offspring are considered "impure" for many generations.

    Unpredictable - new traits may not all be desirable.
    Must choose outcross breed whose qualities complement or match own breed.
    May take years to eliminate unwanted traits/loss of type.
    May take years to get consistent offspring.
    Produces many variants not suitable for use in breeding program

    Copyright 1996, 2001, 2003 Sarah Hartwell

    Best wishes,
    met vriendelijke groet,
    Marjan Boonen
    Boonland, a red hot catspot


  • I'd be interested to see what other breeders think on this subject.  Not being a breeder myself I have no input, but do wonder about inbreeding etc.
  • I think overall temperament has improved over the years, I much prefer out crosses but will do close matings.  But it is getting very difficult to get a true outdross now (here).  I have worked with hybrid lines and didnt find any problems but thats because I think there was some solid work put in by the person doing the initial hybridisation.  Id like to see some more hybrid programs but it takes up space and years but may well be necessary soon.
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