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The quickest answer Hiss Off Cat Vintage Shirt . would be to look to the but I will buy this shirt and I will love this 50/500 “rule”, even though using it is like calculating math answers with a slide rule when you are competing against people using today’s computers. Quoted from Britannica.com: “the “50/500” rule, which suggested that a minimum population size of 50 was necessary to combat inbreeding and a minimum of 500 individuals was needed to reduce genetic drift]”. But you’ve set out a problem that has a whole lot of “ifs”. You say the dogs are the same breed, and ALL modern breeds are already inbred to some extent. So, how inbred was the starting population in the bunker? The question also assumes “genetic diversity” means some specific goal, but it doesn’t. A group of dogs could survive while essentially having multiple inherited health issues. Do we want to have a healthy population? Or just enough to survive. And then, how LONG do we want the population to survive? One hundred years? Fifty generations? Infinity? (Nothing survives into infinity.) You see, with dogs, that “population of 50” means a BREEDING population. Meaning ALL of that 50 are eligible for breeding. They are not too young, and not too old. They are healthy and of sufficiently distant relation to the others of the 50 that we are not increasing the coefficient of inbreeding with their mating.
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As a rule of thumb, if you had a healthy population of dogs of a single breed, you’d probably want to start with at least 500 dogs, and 2,000 would be better Hiss Off Cat Vintage Shirt . As a real-life example, look to the but I will buy this shirt and I will love this revival efforts for the Welsh Sheepdog. If I recall correctly, they started with a candidate population of about 2,000, and winnowed that down to a breeding population of about 80, with occasional outcrosses still being allowed. However, there is another wrinkle in the question that may have an impact. The question speaks of dog “breeds”. This is an artificial label that began being applied in the 1800’s, and that concept is extremely problematic. In a reply, you (the question’s author) state: “ if something happens to the earth there will still be humanity and dog breeds”. And you also state that this is in a “self-sufficient city of exactly 2800 people”. Now, without thousands of dogs, you wouldn’t get “breeds” plural. And restricting such a survival effort to dog “breeds” would exclude much of the genetic diversity of dogs in general. In my opinion, you could get one breed to survive, maybe two – but you’d lose a LOT of genetic diversity in the process.
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