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Estimation of methane production in ruminants


, : Estimation of methane production in ruminants. Animal Science & Technology 64(8): 790-796

The relationship between dry matter intake (DMI) and methane (CH-4) production was investigated using results obtained from 190 energy balance trials with dairy cattle, beef cattle, sheep and goats to predict total methane emission from livestock in Japan. The results were as follows : 1) CH-4 production per unit of feed intake decreased as feeding level increased although the absolute amount of CH, production increased. 2) Therefore, the relationship between CH-4 production (Y, l/day) and DMI (X, kg/day) can be expressed as a quadratic form. The equation best fitted to the data for all animals was Y = -17.766 + 42.793 X - 0.849 X-2 (r=0.966). 3) From the estimation equation, average dry matter intake and cattle populations, annual CH-4 production was estimated to be 0.182 teragrams (Tg) from dairy cattle and 0.150 Tg from beef cattle. Total CH, emission from ruminant livestock in Japan was estimated to be 0.332 Tg/year, and total CH, emission from all livestock including ruminants, pigs and horses was 0.345 Tg/year in Japan. This only accounts for around 0.5% of total CH-4 emissions from animals all over the world.

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Related references

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