Justification for banning milk and chicken, as extension of laws banning milk and meat? So, the Torah says , “thou shalt not boil a calf in it’s mothers milk”. I can understand interpreting this to mean that one should never have beef and dairy in the same meal. I can understand interpreting this to mean that one should never have the meat of any mammal with dairy.

However, there is not, nor has there ever been, a chicken that produces milk. If one was ever found it would change everything we know about biology and evolution. Did the Rabbi’s of old just assume people were too dumb to tell the difference between fowl and meat?