Re: where have the stewing hens gone. And for that matter, fryers or roasters.
Modern chicken farming is more specialised. Used to be, a farms flock was sold at different times for different purposes. Now, farms specialise, some do eggs, with a sideline in chickens of older, lesser quality. Others do meat birds.
So, egg farms just dont let their birds get that old. Laying hens only live long enough to get through their youthful burst of reliable daily eggs. Once they start tailing off, they dont get to stick around just to help make up the numbers and be sold as stewing hens, as in the old days. Nope, they are out, replaced by a younger girl. They are butchered and sent along to value range brands or for the making of ready meals, canned products and, yes, pet food. Chickens meant to be sold as meat live long enough to make weight, without being expected to lay eggs for a living. Essentially, they are all what we used to call fryers in the US, young birds, but fattened up to different levels. Really large burds labelled as premium roasting types are larger breeds but still quite young birds.
Capons, which used to be a sideline on chicken and egg farms, arent seen as worth the effort to keep them from fighting each other on their way to premium price and hardly anyone needs cocks for morning wake up calls, so few boy chickens live long after being determined to be boys. They are killed so soon they arent even worth anything for pet food. Just out with the garbage. Some very fancy farms might raise some to sell at posh shops, bit few of is are going to pay the price to make it worthwhile.