Not enough, they need atleast 18%. There's also not nearly enough vitamins, minerals, amino acids in barley/milk/molasses. There's hardly any chicken usable nutrients here since they don't digest dairy well.
Chickens are omnivores, like us, if you couldn't survive on that diet (you couldn't) neither can they and they need to lay eggs and grow feathers on top of just 'survival '.
The only reason they're even still alive is that they get to free range a little, and since winter is here, they definitely need food now.
It's like feeding cows only corn, you know they couldn't live and be productive on that.
If you don't want to buy real chicken feed, I'd recommend rehoming them; Considering how hard family farms are under scrutiny from agencies and anti-farm folks, you don't want any reason to attract their interest because this type of care would be considered neglect by most people and farmers do not need any bad press.
If you need help picking out a feed, we can help. :] or if you need more information on anything, just let us know.