They are used for a variety of purposes, including as fuel for cooking and heating, as well as in religious ceremonies such as Agnihotra. These cakes are considered to be a pure and natural source of fuel, as they are made from a renewable resource and do not produce harmful emissions when burned. However, it is important to note that cow dung cakes should be used in a well-ventilated area. Holy Cow Dung Cake Manure Upla Gobar Cakes Pieces for Hawan Pooja Katha Agnihotra Yagna Fertilizer.