August 2 2017: Duck Herding in the Kerala Backwaters

Do you know if they use the duck's eggs, or whether they're harvest for their meat?

I don't know for sure, but I think that the ducks are probably bred for their meat. Having said that, I did not once see duck on any of the menus here. The destination markets, however, might be elsewhere in India or even abroad.

In Bali I watched from my rented house in the rice paddies as ducks were regularly brought to the fields to eat insects and fertilize the crop.  Not to say they don't eat them, too, but probably a similar routine in So. India.