PURPOSE: To obtain the subject clean green feed of excellent quality rich in nutritive components and required for bleeding a Coleoptera insect such as a beetle or a stag beetle for a pet by using young buds and leaves of a broadleaf tree as the raw material.

CONSTITUTION: Young buds and leaves of a nontoxic broadleaf tree such as Japanese beech, Quercus acutissima, oak, sasanqua or sweet osmanthus are collected and cut to a prescribed size, e.g. about 2-5cm. The resultant cut material is dried to obtain a green feed. Saw dusts or tip dusts of a nontoxic broadleaf tree or a culture medium for a mushroom prepared by mixing a sugar therewith is added to the above-mentioned green feed as necessary.