SJS:
You are still VERY unclear.
But it sounds like you are saying that meat is the male part and milk is the female part and can’t be mixed, similarly chicken can’t be mixed with eggs which is the female part. This is what it sounds like you are saying, explain otherwise if this isn’t what you are saying.
This issue is not the issue of Bassar Bechalav at all. In fact, there are many pages in Shulchan Aruch dealing with how to use the meat of udder as kosher.