One would be too many.
I am not hypocritical enough to say I disapprove of slaughtering animals, when they are going to be eaten, however this is slaughter for ritual, done in such an inhumane manor and is simply indulging in blood lust for superstition with the goal of pleasing Gadhimai, the goddess of power out of the belief that animal sacrifices to the Hindu goddess will end evil and bring prosperity.
They do not even eat the meat from the animals (other than the goats) it is a disgusting waste and cruelty for cruelties sake