I have Comets for egg production, but I'm years into a culling process to try and get a good dual purpose sustainable bird for my area. Its slow going, as expected. Comets were but one of the birds I used as genetic stock (because I bought during the pandemic, and choices were limited)
If you aren't already feeding your birds 24% protein feed before adding a little bit of nutritional yeast to their diet, its not a concern. Some of us (self included) do for the first months, and that's real high (according to an old study, much maligned). If you are feeding a more typical...
Re: Tryp - if you are feeding the traditional Corn/Soy diet and you have good numbers for crude protein, Met, and Lys, its almost impossible to miss your Tryp number, which is quite low. Among common feed ingredients, very high levels of Tryp in Blood meal , Sesame meal (OK, that's not so...
I've used Nutritional Yeast myself. The one concern is that its high protein - potentially 50% - which can lead to rapid gain of size, potentially putting on muscle mass before the bones, ligaments, joints have sufficient framework to support it. That's speculated as one of the methods by...