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Yes. I was trying to keep things very simple. Your post above backs up my point about the necessity of high protein feeds. Gett a decent methionine content and the chicken should be able to take care of the other essential amino acids from a reasonably varied diet.they can synthesize a lot of what they need, converting carbs to proteins and vice versa; it is only the essential amino acids that they need to consume because they can't manufacture them from other foodstuffs that they eat. There's also the issue of bioavailability.
There's quite a good overview - for human nutrition - here
https://www.msdmanuals.com/home/dis...f-nutrition/carbohydrates,-proteins,-and-fats
from which I excerpt this tidbit
"The percentage of protein the body can use to synthesize essential amino acids varies from protein to protein. The body can use 100% of the protein in egg and a high percentage of the proteins in milk and meats. The body can use a little less than half of the protein in most vegetables and cereals.
The body needs protein to maintain and replace tissues and to function and grow. Protein is not usually used for energy. However, if the body is not getting enough calories from other nutrients or from the fat stored in the body, protein is broken down into ketone bodies to be used for energy. If more protein is consumed than is needed, the body breaks the protein down and stores its components as fat.
The body contains large amounts of protein. Protein, the main building block in the body, is the primary component of most cells. For example, muscle, connective tissues, and skin are all built of protein."