The ration usually fed to non-productive animal like old layers, dry or non-lactating animals is called

A maintenance ration is the feed given to an animal solely to sustain its basic life functions without any additional production output. It provides just enough energy and nutrients to maintain body weight, body temperature, and essential metabolic processes such as breathing, circulation, and cell repair. It is the ration fed to non-productive animals such as old layers that have stopped laying, dry cows (not currently producing milk), and non-lactating animals.

The other types of rations serve different purposes:

• A production ration is fed in addition to the maintenance ration to support specific productive activities such as egg laying, milk production, growth, or work.
• A supplementary ration is extra feed given to animals on pasture to make up for deficiencies in the grazing material.
• A balanced ration is a feed that contains all the required nutrients (proteins, carbohydrates, fats, vitamins, minerals, and water) in the correct proportions for a specific class of animal. It describes the nutritional completeness of a ration, not its purpose.