I know this was covered above, at the end of the day if you are already feeding them a staple diet of poultry feed and just want a little more protein boost, mixing in some dry cat food is the simplest cost effective way... And although cat food isn't designed for chickens the fact that you are still giving a staple of poultry feed will fill in the gaps as a temporary ration... As said look at the bag of cat food and see what it contains and what level of protein it has...
I'm not going to get into a cat food debate, sure there are better cat foods but in this instance IMO for a temporary protein boost you don't need top of the line...
Take for example a bag of 9 Lives Indoor complete @ 30% protein...
One 20lb bag of 9 Lives @ 30% mixed with one 50lb bag of 18% poultry feed, gives you about 21.4% protein final...
I'm not going to get into a cat food debate, sure there are better cat foods but in this instance IMO for a temporary protein boost you don't need top of the line...
Take for example a bag of 9 Lives Indoor complete @ 30% protein...
One 20lb bag of 9 Lives @ 30% mixed with one 50lb bag of 18% poultry feed, gives you about 21.4% protein final...