as lemon said, we keep our chooks on a pretty much vegan diet.
a good seed mix is all we give them in terms of a main diet, three times a day (morning midday and night) plus we supplement their diet with weeds from the garden (they love dandelion leaves)
and if your okay with it, they love eating snails, worms and pretty much any grub or bug
again, if your okay with it, they love eating the washed-up cuttle fish bones from the beach.
its really good for their eggshells, to keep them hard.
i think when they start eating eggs, they have low calcium, but you'd have to double-check (they could just be naughty and i don't want to admit it to myself)
if they are a bit sick, soak some bread in water and put crushed garlic through it
i'm curious, what are you planning to do with the eggs?
if i were to go vegan, i would still eat our chickens eggs cos i know they are well treated.
thats pretty much all
chooks have the most gorgeous nature