You read the earlier part here.
What About Eggs?
Don’t feed your cat raw egg whites, because they contain avidin, wich binds to the B-vitamin biotin contained in yolks. When fed together, the avidin binds with all the biotin, preventing your cats’ bodies from absorbing biotin.
Instead, you can feed your cat raw egg yolks alone or in conjunction with lightly poached egg whites because cooking deactivated avidin, taking care of the imbalance issue. If you feed your cats eggs only occasionally, you can feed them the whole egg, including the shell, by running it through the grinder. However, if you plan to include eggs in your regular recipes, it’s a good idea to lightly cook the eggs whites but leaving the yolks raw.
Biotin – Wikipedia
Biotin, also known as Vitamin H or Coenzyme R, is a water-soluble B-complex vitamin.
Avidin – Wikipedia
Avidin is a tetrameric biotin-binding protein produced in the oviducts of birds, reptiles and amphibians deposited in the whites of their eggs.