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breeding a longer lived dog
I posted this 20 years and a few weeks ago. As best I can tell nobody has started work on breeding a health mid-sized dog with a 20 year life expectancy.
Since I wrote this the cost of canine genome sequencing has fallen enormously, and now we can measure telomere lengths, so there are even more tools to use when selecting stored gametes for in vitro fertilization and implantation. You'd think there'd be a billionaire somewhere who'd give this a shot. We have a lot more billionaires now ... On Friday, June 27, 1997 at 2:00:00 AM UTC-5, John G. Faughnan wrote: I hope I am not resurrecting a long dulled discussion, but I have wondered for some years why we do not attempt to breed a longer lived dog. As our lifespans lengthen, the gap between the terribly short lifespan of our companions and our own lives is growing longer. I wish my 8 yo mixed breed companion could have a longer active, healthy, life than we can expect. Canine lifespan is highly variable. True, it is related to size, but there are some short-lives small dogs and some longer-lived medium sized dogs. (Of course Great Danes are sadly short lived). Size alone is not everything. Breeding for longevity is, obviously, tougher than breeding for attributes that manifest early. Still, I can think of a few ways to begin. The goal would be a mid-sized dog, with a companionable temperament, with a heathy active lifespan of 13-15 years, followed by 3-5 years of old age. This seems close enough to current canine lifespans to be achievable without major genetic engineering. Of course this would not be pure-bred! It would be a new breed that would take generations to stabilize. We could begin with long lived healthy male dogs who are still sexually active. They could be bred with young female dogs of a healthy line. A longer-lived mid-sized dog could be crossed with a smaller longer-lived dog. I suspect dogs with delayed onset of puberty would be likely to have longer heathy lives, and delayed onset of puberty is obviously much easier to use as a breeding marker than long life. There are other techniques to consider. We could freeze ova from potential female candidates (this is done in humans seeking IVF, and is not a dangerous procedure). Those that had delayed puberty and physiologic markers of youthfulness in middle-aged could be selected for fertilization from similar males (young females, could, of course, bear the pups). Such a breeding program would take time, perhaps 30-60 years, to achieve the desired goal. The dogs entered in the program would, however, be desireable for their optimized health and vigor. They would also carry the cachet of being the fore-runners of a new breed of dog. Comments? -- John Faughnan M.D. (To form my email address, remove the text -remove- from this string. I had to do this to foil spam robots.) http://dragon.labmed.umn.edu/~john/ |
#2
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breeding a longer lived dog
Hi John,
Great discussion. There is a book called Nutrition and Physical Degeneration by Weston Price that has some interesting things to say about the generational effects of malnutrition on human beings. Much of those nutritional observations were also documented in livestock by a University of Missouri professor named William Albrecht. I'm willing to bet that the longest lived dogs will be produced by breeders who feed raw whole foods to their dogs generation-over-generation. Based on the above two schools of thought, which I think you will find are interesting rabbit holes. Cheers, -J I posted this 20 years and a few weeks ago. As best I can tell nobody has started work on breeding a health mid-sized dog with a 20 year life expectancy. Since I wrote this the cost of canine genome sequencing has fallen enormously, and now we can measure telomere lengths, so there are even more tools to use when selecting stored gametes for in vitro fertilization and implantation. You'd think there'd be a billionaire somewhere who'd give this a shot. We have a lot more billionaires now ... On Friday, June 27, 1997 at 2:00:00 AM UTC-5, John G. Faughnan wrote: I hope I am not resurrecting a long dulled discussion, but I have wondered for some years why we do not attempt to breed a longer lived dog. As our lifespans lengthen, the gap between the terribly short lifespan of our companions and our own lives is growing longer. I wish my 8 yo mixed breed companion could have a longer active, healthy, life than we can expect. Canine lifespan is highly variable. True, it is related to size, but there are some short-lives small dogs and some longer-lived medium sized dogs. (Of course Great Danes are sadly short lived). Size alone is not everything. Breeding for longevity is, obviously, tougher than breeding for attributes that manifest early. Still, I can think of a few ways to begin. The goal would be a mid-sized dog, with a companionable temperament, with a heathy active lifespan of 13-15 years, followed by 3-5 years of old age. This seems close enough to current canine lifespans to be achievable without major genetic engineering. Of course this would not be pure-bred! It would be a new breed that would take generations to stabilize. We could begin with long lived healthy male dogs who are still sexually active. They could be bred with young female dogs of a healthy line. A longer-lived mid-sized dog could be crossed with a smaller longer-lived dog. I suspect dogs with delayed onset of puberty would be likely to have longer heathy lives, and delayed onset of puberty is obviously much easier to use as a breeding marker than long life. There are other techniques to consider. We could freeze ova from potential female candidates (this is done in humans seeking IVF, and is not a dangerous procedure). Those that had delayed puberty and physiologic markers of youthfulness in middle-aged could be selected for fertilization from similar males (young females, could, of course, bear the pups). Such a breeding program would take time, perhaps 30-60 years, to achieve the desired goal. The dogs entered in the program would, however, be desireable for their optimized health and vigor. They would also carry the cachet of being the fore-runners of a new breed of dog. Comments? -- John Faughnan M.D. (To form my email address, remove the text -remove- from this string. I had to do this to foil spam robots.) http://dragon.labmed.umn.edu/~john/ |
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