Barley is not all that good for poultry used to produce eggs a far better grain would be Wheat..
This is a Quote from--
POULTRY FOODS AND FEEDING By DUNCAN FORBES LAURIE on Barley and Wheat.
Barley- is generally lower in protein than wheat,
but the starch content is about equal to that of an average
soft wheat. The fat content is low, and there is, in most
samples, a high percentage of fibre, which is indigestible
and of little food value to poultry. Wheat and rye
kernels have smooth, thin skins, or outer coats, but
barley kernels are enclosed in hard fibrous sheaths mainly cellulose..
As regards cost barley is a cheap food in most countries.
It is not a good egg-producing food, but is largely used
in fatting poultry. It may be given as a change of
food, and with advantage in cold weather. The mineral
content is low and, as in other cereals, is acid.
Wheat.I have always regarded wheat as the best
staple grain food for poultry. In many countries maize
(com), rye, oats, and barley are chiefly used, as they
are often cheaper than wheat. The value of wheat,
however, is now more generally recognised, and, where
egg production is the main object, it is undoubtedly of
first importance.
Chris