What is going on with golden bird's buttocks

Most of the golden bird's buttocks are not clean, and severe enteritis.There are more things to feed such birds artificially, such as millet, valley, soybean noodles, corn surfaces, nest heads, dog tails, etc., and can also eat chopped vegetable leaves.This bird cannot be hungry for too long during the chicks. If the bird does not feed, it is necessary to use egg yolk and green vegetable juice to be mixed into a paste to feed the chicks.