The dung is collected only from the cows
( not from Bulls...ha ha ha you can't call it bull shit :))).
They get the best feed starting with a tub of soaked and ground cotton seed which is supposed to be very healthy. They graze on fresh green grass and plants on the hill. They also eat the hay. They are givens greens and bananas and fruits. Cow's milk is very healthy. Now the cakes are heaped on a clean ground which has been cleansed with cow dung( in olden days, before the era of soaps and detergents, cow dung was used as a purification agent. )There are priests who are called to repeat some chants for half an hour and then camphor is lit , coconuts offered and the camphor is dropped on the heap of dry cakes. They burn very very slowly and after a day we can see a mount of ash. This is strained in a huge strainer and used as Sacred Ash. The sacred ash has some medical properties too. They are good cure for insect bites too.