Totally agree with Dinosaw about dropping the maize, and I would also cut out the biscuits and cake (high in fat and sugar, both no-nos for chickens) also soft sweetcorn (which is an additional source of sugar as its more maize) Also I don't see the need for the pigeon food as it's yet more maize plus some quite fattening pulses. Bread is nutritionally poor for chickens and just fills them up when they should be eating a better balanced feed in their pellets.
Any ONE of these things could be given in VERY small quantities once a day, as treat, but all of them together as part of a mainstream diet will produce fat hens that won't be able to lay, because the fat gets laid down round their ovaries and oviducts. This can even cause fatal problems in their later life. Like us, chickens do like what for them is junk food - but like us, they're better off just being fed a plain nutritionally well- balanced diet. For hens, this is layers pellets plus greenstuff, as Dinosaw says.
Opinions differ about giving cat food or dog food - under some circumstances, eg when trying to get a poorly hen to eat more protein if she can't manage normal food, it can help to get a bird back on her feet. Even then, there are alternatives, such as chopped hard boiled egg. But again, as part of a normal diet, it's not desirable and certainly not necessary. Its best to just give a few mealworms as an extra protein boost, or as a treat, but even then, avoid an overdose!
