As a metaphor, he uses a trained beast in a menagerie which is said to be "improved", but which in reality has lost vitality and is only weakened.
The law of Manu, on the other hand, tries to organize social groups by creating four castes of people.
In his view, the humiliating and oppressive edicts against the Tschandala are a defensive means of keeping the castes pure: Yet this organization too found it necessary to be terrible—this time not in the struggle with beasts, but with their counter-concept, the unbred man, the mishmash man, the chandala.
By this he means that Judaism and Christianity after it are the morality born of the hatred of the oppressed (like the Tschandala) for their oppressors: Christianity, sprung from Jewish roots and comprehensible only as a growth on this soil, represents the counter-movement to any morality of breeding, of race, privilege:—it is the anti-Aryan religion par excellence.
Christianity, the revaluation of all Aryan values, the victory of chandala values, the gospel preached to the poor and base, the general revolt of all the downtrodden, the wretched, the failures, the less favored, against "race": the undying chandala hatred as the religion of love...[3]In The Antichrist, Nietzsche again cites the law of Manu, and favors it in a relative sense to the morality of Judeo-Christianity.