It is better not to feed egg whites alone, since it contains a substance called avidin which makes biotin unavailable for use in the body. Egg whites are mostly water so they are not missing out on anything.
I have heard that cooking deactivates the avidin, but I cannot be sure, so I always just feed yolks. I am in the midst of finding homes for a large number of kittens, and I will be posting pics of each one, before they go to their new families :)
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