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The founding birds of the U.S. population does appear small from as I understand 3 or 4 importation events. Even so, based on pictures, genetic variation was pretty high in those birds. More imported birds probably needed. Something Icelandics have going for them is the large number of folks keeping and swapping them. Makes for lots of what are called metapopulations that can help keep rare genes alive longer. Some additional efforts might help conserve the existing genetic variation. A few flocks need to be made up of a larger number (> 25) breeding birds that can mate randomly. Secondly, the older birds are more likley to be holding on to rare genes so keeping breeders to more advanced age can keep genes from being lost as fast. It may be prudent to use linebreeding back to those birds if size loss noted but would be wary of selecting for larger birds. I would also promote hen raised chicks as that may provide a selective force against individuals that are suffering inbreeding depression. Hen raising of chicks enure more equatible reproductive out put of hens, otherwise hens that produce more eggs will always be at an advantage. If not carefull with incubator production, one could be pushing Icelaqndics to being like leghorns. Hen raising also more fun. Free ranging would also promote individuals with good constitutions but as result will incur losses to environmental stressors and predators. Overall it going to be difficult to keep Icelandics in U.S. identical to those in Iceland. Conditions are so different and it is very difficult to prevent natural selection and genetic drift from having their way.
Thanks for posting this. I'm working to change my flock to solely Icelandics. May take a few years but as my numbers build, they will become my only breed. Of course, if I was to move from NotAFarm to a place where I had no covenants it would be much easier to, as Sigrid said, "let nature take its course". There is a saying and it's early so I may not get it quite right but "I am only one person and I can not do everything. But because I can not do everything, that doesn't mean I should not do the something I can." That's the gist of it anyway and how I feel about my part in the preservaton of the Icelandics. Seinna, The Other Mary