Dug a little on Paprika.... It is used for a color enhancer in caged birds. A very very little goes a long way. Its the capsacian (sp?) but the same results can be obtained with adding carrot to the diet.... Again Caged birds like canaries.
In horses the dosage is one table spoon per day. The Capsacian is testable ..... On an olympic level, it also tends to make the skin more sensitive. Hence the reason its tested for.
It makes black horses blacker and red horses redder.
For chickens it makes the yolk Richer in color, according to the one study I read.
http://japr.fass.org/content/20/1/90.abstract
So it would be an interesting experiment. But for chickens I think just adding hot peppers to their diet would be a plus all around. they like em its good fortification against natural parasites. and cheaper than paprika....
deb