This trial studied the production of methane (CH4), carbon dioxide (CO2) and volatile fatty acid (VFA) of ammoniated rice straw during in vitro rumen fermentation. Different levels of urea, i.e. 0, 2%, 4%, 6% and 8% were used for the ammoniation of rice straw as experimental treatments Ⅰ (control), Ⅱ, Ⅲ, Ⅳ and Ⅴ, respectively. The Menke’s in vitro gas production technique was used for a 48 h in vitro fermentation. The productions of CH4, CO2 and VFA were analyzed using gas chromatography. The results showed that the crude protein content of rice straw was significantly increased by ammoniation treatment (P<0.01), while the neutral detergent fiber content was significantly decreased (P<0.01); the production of total gas, total VFA (TVFA), CH4, CO2 and acetate was significantly increased by ammoniation treatment (P<0.01), while acetate/propionate, and gas relative production (CH4/TVFA, CO2/TVFA and total gas/TVFA) was not affected (P>0.05). In conclusion, upgrading the feeding quality of rice straw for ruminants using ammoniation treatment will inevitably increase the production of CH4, CO2 and total gas. It is suggested to investigate techniques and products in the future for mitigating CH4 and CO2 production from rumen fermentation when ruminants are fed ammoniated rice straw.
ZHAO Guangyong
,
LI Bing
. Effects of Ammoniation on Methane, Carbon Dioxide and Volatile Fatty Acid Production of Rice Straw during in Vitro Rumen Fermentation[J]. Chinese Journal of Animal Nutrition, 2013
, 25(8)
: 1769
-1774
.
DOI: 10.3969/j.issn.1006-267x.2013.08.027
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