No, I would never turn them into stew. They’re part of the family. Enjoy having them even if they’re not laying but perplexing about it because otherwise they look like perfectly healthy not too old birds. I have several chickens that are laying and they share the same feeding trough so I don’t know how I’m supposed to separate the layer feed from the non-layer feed. And presumably 16% not high enough protein anyway? Perhaps I’ll try a higher amount of protein (18%?) but I still don’t know how to separate them for feeding as they are all together. What is the downside to them eating layer feed when they’re not laying? When eventually I would think they will lay again. So what’s wrong with feeding them Layer feed in the meantime?16% is not a high protein feed. And if your birds aren't laying eggs they shouldn't be eating layer feed.
If your birds are 3 years old, once they finish molting they don't generally pick back up again laying until the spring. They're taking well deserved break from cranking out all those eggs. It's the natural aging process of a chicken. If you don't want to keep them around because they aren't producing eggs for you you can turn them into stew. I personally let my birds live out there complete lives here whether they're laying eggs for me or not because I enjoy them so much.
And by the way, my rooster shows no interest in the Brahmas. So I don’t know if it’s because they haven’t been accessible or he senses they’re not fertile. He’s a very nice rooster that does his duty; he’s nice to the chickens and to people. But he goes for the Americauna and the white Leghorn, which are smaller birds; I don’t know if that has anything to do with it. He is a very large drama. Can’t recall if he was readily fertilizing the Brahmas in the past, but that’s not what I usually see. Is there any association between his lack of interest in them and the fact that they’re not lying?