It is always best to post a link when citing something otherwise, we have this tendency to just drift around. And, this is one of my favorite resources for trying to understand the nutritional needs of chickens.
Poultry Scientists at Auburn University, Alabama Cooperative Extension System
As Mac and the professors said, ". . . during summer when temperatures are high, a higher dietary protein level should be fed. During winter, when temperatures are low, a lower protein diet can be fed without affecting egg production." And, they outline that in Table 3 with regards to Feed consumption: lbs/100 hens/day relative to Dietary Protein Level (%).
Additionally, there's other good info on that page
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Steve
Poultry Scientists at Auburn University, Alabama Cooperative Extension System
As Mac and the professors said, ". . . during summer when temperatures are high, a higher dietary protein level should be fed. During winter, when temperatures are low, a lower protein diet can be fed without affecting egg production." And, they outline that in Table 3 with regards to Feed consumption: lbs/100 hens/day relative to Dietary Protein Level (%).
Additionally, there's other good info on that page

Steve