vitamin deficiency

Have this question running in another thread, but figured I'd make a separate thread for more views, having the right question in the title line. Can somebody detail, exactly how much of what they should be getting? I always get confused on the percentages. Teaspoons/table spoons etc, would be...

We have a White-fronted Amazon of indeterminate age. He was rescued one early December morning in 1987, found clutching to the rapidly cooling engine of a motorcycle on the means streets of Canadian Gotham. He's been in the family for 21 years. Today, his feathers are a pretty sad sight. An...