well...you all know how I feel on cat food and I have posted the links and reasoning behind my objections several times ...it can potentially be detrimental to your birds health and even deadly in the right circumstances and for this reason I feel it should be left off the chart (as when you put it on it is as if you are condoning its use) I will repost here one of the sources for my objection:
http://www.omri.org/Amino_acids_livestock.html
..."While it is nutritionally essential, methionine excesses are far more toxic to poultry than similar excesses of tryptophan, lysine, and threonine (National Research Council, 1994). Force feeding methionine to excess
can result in death to chicks (National Research Council, 1994).
A dosage of 2 g / mature cat / day (20 to 30 g / kg dry diet) for 20 days induces anorexia, ataxia, cyanosis, methemoglobinemia and Heinz body formation resulting in hemolytic anemia (Maede, 1985). ..."