crumble is just the size the feed come in, there mash which more powder, crumble, broken up pettles, then pellet,
i really like pellet, so much doesn't go to waste,
starch is like a treat of grains, i give mine egg girls it 3 to 4 times a week, as for veg and fruit i give it when i ever i have it, and in the summer its every day, i give enough that they will with in 5 mins
you dont mix feed with starch,
i just throw the starch on the ground and they eat up that way.
if your chickens are free range or have access to dirt they really dont need grit in their feed, i only add grit in the winter
I dont give mine yogurt at all, if they need acidodphlies (sorry speilling). i give that in either a electrolyte powder in their water, or i will add some to their feed.