You can breed an offspring son back to the siamese mother or breed 2 siblings from your future litter. You will have a higher chance for siamese if you breed a son back to the parent siamese.
Just think if it like ball python recessive genes. And siamese is the visual recessive. Any offspring from that siamese parent will be 100% het for siamese.
And I can't tell you how difficult switching to Norway rats from ASFs are going to be. I've never had to try. But if you have any strong feeders, I suspect they will be the easiest to switch compared to the more picky ones.
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