Green poop - any ideas?

[149east]

Help! My rooster has emerald green poop (where it should be white). The poop is otherwise well formed any he is eating fine. A little lethargic. Crop is not impacted and he is not malnourished. Is in a coop with no new birds, no outside birds. All other birds are fine. Any ideas? (PS it is probably even greener than it looks in the photo... Has been so for at least 3 weeks) Thank you

 

[toptom]

woah so green, do they eat leaves?

 

[149east]

No. It is an enclosed yard, and these guys don't free range. Food is regular chook food (seed), plus some starter mix as there are some newly hatched chicks in there. The starter mix is the one without the antibiotic in it - though it would be a little high protein (maybe the protein has stuffed his liver?!). Plus the ups all get table scraps - though I'm pretty careful with table scraps (no dairy) - though they may get a little more bread than they ought to. But the others are healthy as horses!

 

[toptom]

could be liver failure based on this thread:

https://www.backyardchickens.com/t/79949/florescent-green-poop

But to be honest, Ive never seen this kind of poop. Though Ive seen green poop but not this green.