yes they are only fed layers pellets and rolled barley with some supplements and oils. But these birds are also washed for shows - any washing tips for white birds?
Sunshine causes the feather to yellow. Many show people do not feed corn or maize products as it lightens the eye colour, and in breeds with ' bay ' coloured eyes that can be the difference between placing and not.
Excessive protein in the diet can cause visceral gout and organ damage, getting the feed ratio is tricky , poultry need amino acids methionine and linoleic acid to synthesis protein. Birds that are deficient in methionine have poor feather development and growth, where as excessive amounts of methionine can lead to
' heinz body Anemia ' and death. So unless you have a science degree , it is best to feed a good quality , well balanced poultry feed. Once a week my birds get cooked rice or pasta and raw eggs mixed through with sardines in olive oil to enhance feather shine.
Poorly processed fish meal can lead to thiamine deficiency and that is when you start to see wryneck in your flock. My point is , there is a science to getting it right and I belong to the KISS theory. ( keep it simple silly ). Hehe.
http://www.merckvetmanual.com/mvm/p..._poultry/vitamin_deficiencies_in_poultry.html