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But you Gotta Know This:  even though it's a brand name feed, it still won't cost NEARLY as much as feeding a cat or a dog.  It's incredibly inexpensive compared to other pets.  So, no worries, mate: there's more known about chicken nutrition than any other nutrition, and giving them Purina feed is a very easy means of getting the best enjoyment from a pet.  Just keep it in a secure can so it doesn't get moisture and so your neighbors can't accuse you of attracting rats.  
It takes us nearly 8 months to use up a 40pound bag of Purina Layena. What a way to spend $11!  I spend up to $30 all year on my 13 chicken's feed/treats.  Mostly they need it in the winter when the ground is frozen; in the summer we sometimes lock them up in the run to force them to notice the feed instead of gulping down worms and critters.  (Your wife might like that part; they eat mice, spiders, ants, slugs, locusts, japanese beetles......) 
I even like the Purina slogan, something like "Pets make better people, Purina makes better pets".