WRJAS Greenhouse gas emissions from dairy farming in Bangladesh

Livestock is a vital source of methane and nitrous oxide gas which are considered as hazardous greenhouse gas (GHG) causing global warming. This study was conducted to assess GHG emissions from different livestock categories of different (small, medium, large) dairy farming in Bangladesh by using IPCC guideline 2006 and CIGR 2002. The emission rate of CH4, N2O (mainly emits from manure) is increasing day by day in dairy farming due to poor manure management systems. The study was estimated maximum 20% CH4 was emitted from dairy cow and minimum 8% CH4 was emitted from calf. Least N2O emission found from a farm 0.015 Kg headyr where manure was properly utilized by anaerobic digestion. On the other hand, most N2O emission found 0.25 Kg headyr from a farm where manure was not properly managed. In this research, it had been observed increasing milk production decreasing CO2 emission and vice-versa. The CO2-equivalent for dairy cattle, heifer, calf, bull, buffalo male, buffalo female, and buffalo calf found 1720.4, 788.1, 649.4, 1161.1, 1588.2, 1624.2, and 725 kg headyr respectively. The emission rate can be minimized by handling proper dietary, which can reduce excretion of GHG during ruminant digestion and manure management practices.