Processed cheese (like those single slices) in very small bits is okay but no diary as birds, like us humans, are lactose intolerant. They cannot digest it. I myself wouldn't even give my birds the processed cheese, nor the cheese on pizza.  My birds love pizza but the cheese comes off.

I hope I have helped some.

Bobbie & Birdz

Birds, on the one hand, get no benefit whatsoever out of products made from milk, they just don't have the enzymes necessary to digest them and food that is not digested just goes right through the system without any of the components getting absorbed by the intestines.  On the other hand, some of them are highly lactose intolerant so the safest thing is not to give them any.  I do admit to giving mine the occasional gloop with a tiny bit of grated Romano cheese in it for flavoring but only once in a while and after carefully checking their stools to make sure it's not upsetting their digestion.

Soy or tofu products like milk, ice cream, cheeses, etc are safe in that they don't contain any lactose but they are also very high in protein, another no-no for parrots, so I don't give any to my birds.

My thought is better safe than sorry. No to dairy...I do not thinks eggs (Cooked) fall into that category.

If you want to add the benefical bacteria that yogurt provides into their diet, then my suggestion is to add acidophillis and lactobacillis into their food. You can find powders as well as liquid forms of this in any health food store.

I say no to cheese and other dairy items.

For beneficial bacteria, there's nothing like Avian BeneBac, no need to feed yogurt.

Well, I would not go by that vet's opinion unless he was a strict vegetarian who only consumed organic and whole grains with no onions, salt, iceberg lettuce, white sugar, anything fried or stewed, artichokes, eggplant, etc.  Parrots were not made by Nature to eat people's food. 

Phyllis, the reason why they said that is because calcium cannot be absorbed if a particular protein is not present in the body.  This protein can only be made with the presence of vitamin D3, which cannot be produced by the body without exposure to low ultra violet light, something you only get from direct exposure to sunlight (meaning not through glass).   Milk (or yoghurt) has vitamin D3 because it's an animal product (vitamin D3 is only found in animal flesh or animal products like milk and eggs, vegetables don't have it).

But why give birds a milk product when all of them are lactose intolerant (they are not mammals so nature did not give them the enzyme necessary to digest lactose) and would get loose stools from it to provide it with calcium when all you have to do is give them avian liquid calcium (which is especially created for birds) twice a week?  Does that make sense to you?  Because it doesn't to me.

Not all avian vets give the right advice all the time.  I know it's going to sound strange but, unfortunately for our birds, when it comes to diet and nutrition, avian vets are not that knowledgeable.  I always recommend listening to them, making a mental note of their advice and then double-checking it by doing your own research and reaching your own conclusions.  Safer that way.