The correct answer is: b) Rice bran
Rice bran is a by-product of rice milling and is a good source of protein, fiber, and vitamins. It is also a good source of energy and can help to improve poultry nutrition.
Azolla is a small, free-floating aquatic fern that is often used as a biofertilizer. It is a good source of protein, carbohydrates, and vitamins. However, it is not a good source of energy and is not as effective as rice bran in improving poultry nutrition.
Oil cakes are the solid residue left after oil has been extracted from oilseeds. They are a good source of protein, but they are also high in fat and can cause digestive problems in poultry.
Silage is a fermented feed made from green plants, such as corn, alfalfa, or sorghum. It is a good source of energy and protein, but it is not as effective as rice bran in improving poultry nutrition.
In conclusion, rice bran is the best feed supplement to help improve poultry nutrition. It is a good source of protein, fiber, and vitamins, and it is also a good source of energy.