I feed nothing less than 30% protein sourced from animal protein - fish meal and floating catfish feed to overcome essential amino acid deficiencies of plant sourced proteins. I add choline chloride to the chick water to prevent fatty liver syndrome and perosis. Cysteine is not an essential amino acid however when levels of methionine are inadequate cysteine will become a limiting growth factor.
The protein levels in available in commercial poultry feed have been determined by research to provide the best overall results at minimum cost with minimum protein levels. Having higher levels of protein in commercial feeds will provide better results but the added cost does not provide maximum profits.
Poultry as well as other livestock will benefit from a reasonable increase in protein content however the returns do not justify the investment commercially.
My stock developed spectacularly with the increased protein sourced from animal protein. If there's a problem with feeding increased protein i dont see it in the pic.
View attachment 1959893