If birds at point of lay were fed a ration/feed containg: maize meal-65%, fish meal-5% and brewers grain-5%. Name the other ingredients that are essential which are not listed and state their importance.

Bone meal or oyster shell: this ingredient is useful for bone and teeth development. It is also useful for eggshell formation.

Common salt: it improves the palatability of the food. It also supplies sodium in the diet. It promotes the activities of enzymes in the alimentary canal.

Oil: these are additional sources of energy. It provides carotene and prevents dustiness of feed.

Vitamins: these are useful for good egg and bone formation. They ensure normal functioning of the body.