Effects of different composition of brewer grain and rice bran in the concentrate on methane emission of Kacang goat

Abstract

Gases that are trapped in the atmosphere are known as a greenhouse gas and caused the earth warmer. The most abundant greenhouse gas after carbon dioxide (CO2) is methane (CH4). Methane from livestock is mainly from enteric fermentation and manure storage. One of the strategies to mitigates methane emission is by feeding management. This experiment aimed to determine the effect of different compositions of brewer grain and rice bran in the concentrate on methane emission in Kacang goat. Fifteen male Kacang goats (1.5-2 years old and body weight 12.67 ±1.61 kg) were assigned to a completely randomized design. The treatment were T1=48.5% king grass + 9.7% brewer grain + 38.8% rice bran; T2=48.5% king grass + 14.5% brewer grain + 34% rice bran; and T3=48.5% king grass + 19.4% brewer grain + 29.1% rice bran. Mineral mix was added 3% in all treatments. There were no significant differences in all parameters observed. The results of gross energy intake, digestible energy, energy digestibility, and methane energy were 1.0 MJ/kg BW0.75/day, 0.7 MJ/kg BW0.75/day, 67.9%, and 7.88 MJ/100 MJ GEI, respectively. The difference in composition of brewer grain and rice bran in concentrate does not have any adverse effect on methane emission.