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Hello and thanks for your question.
I have been a veterinarian for 30 years and have not heard of this and can't find it in my resources. Is there another spelling? Where did you hear of it?
At 12 weeks, a growing kitten would need a can of cat food daily.
Sorry! Sometimes what I am typing for one customer shows up elsewhere. That last was meant for another cat owner; I apologize.
How is your cat? Can I help with anything else? I have done more searching, and can't find anything called perdum or purdum.