Effect of biochar or biochar and urea supplementation on feed intake, milk yield, feed conversion and methane production of dairy cows

Feed additives belong to a number of climate change mitigation strategies being sought reduce methane emissions in ruminants. In this study, the effect biochar or and urea supplementation on dairy cow performance production was assessed. Eighteen cows were used 3 × latin square design with three feeding groups: control no (CO), (BC, 200 g/day) (BC + U, g/day 90 urea). All fed forage mixture ad libitum 5 kg concentrates per day average. Methane measured respiration chambers. Biochar as well did not affect total dry matter, energy utilisable protein intake. However, lignin intake higher the BC group crude U compared CO group. Supplementation feed milk composition, except for content conversion, diet digestibility affected by strategy. conclusion, does emissions, but it negatively performance.