Bl69aze
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I don’t believe it either or the genetics, otherwise we would only see them in certain “lines” as we have a few racksI maintained about a dozen colonies of mice for quite a number of years and many many generations without adding new blood to any of them. I think I saw one or two 'spinners' in total, the entire time. When I eventually ended those colonies it was because I stopped keeping rodents. I'm sure they'd have continued successfully indefinitely.
I don't buy the 'it's caused by inbreeding' story.
Currently there is no correlation with eachother and what tubs we find them