Yep... I'm suggesting feed everybody the same 20% with oyster shell on the side... But you should do what makes the most sense to you. Here is one link... (which of course will support my POV)..I'll be bringing them in to my vet for a necropsy
If he doesn't find anything we'll discuss sending it off to Abbotsford for tissue sampling.
And my mistake. My older birds are on Hi- Pro feeds layer pellets at 20% protein. Yes, there's a higher calcium at 5%. They also have access to a dish of crushed oyster shells for free feeding.
This one:
https://www.hiprofeeds.com/products/20-chicken-layer-pellets
My younger pullets (everyone under 18 weeks down to 7 weeks) are separated from them and are fed the 18% no calcium grower crumbles. I was considering changing to stage 3 pellets which has 15% protein for layers to be as they're not used as broilers and I didn't want to grow them too heavy/fast. There is a mix barnyards and Orpingtons. Are you suggesting an even higher percentage than 15 or 18%?
My chicks up to 6/7 weeks are fed 20% protein no calcium. They too are also separated from the other groups.
Several of the older ones about 3 years old (layers) are having a very light molt at the moment. Not a rough molt at all.
http://ucanr.edu/sites/poultry/files/186894.pdf
True they are not broilers... but they are a dual purpose breed that have more muscle than light bodied layers... their genetics is not the same as broilers and their growth is relative so that they actually won't face the same bone and joint problems of that freak of nature Cornish cross. In fact "broiler" feed USED to be 25% protein and recently they brought it back down.
When people have issues in their flock with feather picking, molting and things... more protein is almost always the recommendation. I contend not all proteins are created equal.. They will eat to meet a certain "energy" need... energy comes from calories which come from fat, carbs (including fiber), or protein... as far as I know that's it... so 2% farther to the protein side is going to give me more nutrients not fatter birds that grow faster.... I have seen some things that suggest reduced protein to slow growth during a certain phase... they will still reach the same size I think... Definitely NOT set on it though, appreciate the rational discussion about it... WOW, you work really hard with all that separate feeding and such! I can see it is important to you.
I hope you will share your findings, and even your cost for others who might be considering having it done.
I hope your flock recovers quickly and starts to really thrive!