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[B-2.4.1 Methane Production in Ruminants]

[Contact Person]

Mitsunori Kurihara
Senior Researcher, Cattle Nutrition Laboratory
Department of Animal Nutrition
National Institute of Animal Industry
Ministry of Agriculture, Forestry and Fisheries
P.O. Box 5, Norinkenkyu-danchi, Tsukuba, Ibaraki 305 Japan
Phone +81-298-38-8655, Fax +81-298-38-8606
E-mail kurihara@ss.niai.affrc.go.jp

[Total Budget for FY1990-1994]

14,200,000 Yen (FY1994 2,962,000 Yen)

[Abstract]

　The relationship among diet composition, intake and methane(CH₄) production should be investigated to clarify the factors affecting CH₄ production in the rumen and to estimate the CH₄ emissions from ruminant in Japan and all over the world. To achieve the above purpose, we investigated (1) the relationship of CH₄ production and volatile fatty acids(VFA), which is the main energy source of ruminants, in rumen, (2) the effects of quality and quantity of diet on CH₄ production in ruminant, and (3) the simple estimation equation of CH₄ production in ruminants. The results were as follows; (1) The VFA in the rumen was found no relation to CH₄ production. (2) Although the daily CH₄ production was goats < sheep < cattle, there were no significant differences in CH₄ production per dry matter intake among ruminants. (3) The CH₄ production was influenced by the hay-concentrate ratio of diets. (4) The CH₄ production by ruminants fed good quality diets can be estimated adequately from DM intake (X, g/day) alone by the equation CH₄(1/day)=-17.766+42.793X-0.849X², (r=0.950). (5) The CH₄ production of the cows given low digestibility and low nitrogen content roughage was 0 to 10% higher compared with the estimated value obtained from the estimation equation. (6) Annual CH₄ emission from all livestock in Japan was estimated to be 0.345 teragrams(Tg, g*10¹²)/year. (7) Annual CH₄ emission from cattle in the world was estimated to be 67-71 Tg/year.

[Key Words]

Ruminant, Methane, estimation, Dry matter intake, diets