...the average chicken that is not required to lay more than normal or grow big muscles.
Something to think about: what is average?
average of chickens before people started keeping them (12 to 30 eggs per year)?
Or average of previous centuries' birds - before people began wide-scale systematic selection for high production (55 eggs per year)?
Or average of today's birds?
where the 30 breeds of "fair layers" at an example hatchery (Murray McMurray) lay up to 150 eggs per year, the 60 breeds of "good layers" lay 150-220 eggs per year, the 19 breeds of "better layers" lay 220-280, and the 8 breeds of "best layers" lay 280-365 eggs per year.
7 of the 8 "best layers" are among the best sellers.
All of the "fair layers" are among the rare breeds.
50 of the 60 "fair layers" are among the rare breeds.
Even you exclude all of the big commercial egg farms and look at only the backyard flocks, this indicated the average is very high compared to either of the above options.
I wonder if that is the reason france has 10% protein feed and they call it high protein, but US has 16% to 20%.
Yes. Europe allows a lot more individual amino acids than just Met.
Also it said algea has high methionine. I wonder if it is beneficial to leave the algea growing in the chicken drinkers that we all brush out.
Which algae makes a tremendous difference. Some are extremely poisonous (not usually found in drinkers), most are benign but not nutritious for chickens.
Algae has a very high water content; unless it is dried, chickens wouldn't be able to eat enough to make a difference. That is assuming they would eat it in significant quantities.
Not cleaning the drinkers allows other things to grow also.
...And it is only allowed for poultry.
Herbivores can make the Met they need. Most livestock are herbivores. Pigs are also omnivores, and Met is added to at least some pig feed.
Something I wonder is why some people didn't want synthetic met to continue. ...
Because they would like "organic" to mean no synthetics.
And many of the same people who make the most noise about no synthetics are the same people who promote plant-based food in preference to animal-based food.