Methane emission from Japanese Black cows fed hay or whole crop rice [Oryza sativa] silage at a maintenance intake level and the effect of concentrate feeding on emission
2007
Shinoda, M.(National Agricultural Research Center for Tohoku Region, Morioka (Japan)) | Kushibiki, S. | Singu, H. | Ueda, Y.
The objective of this study was to measure methane emission from beef cattle cows fed hay or whole crop rice silage (WCS) and to determine the reduction rate in methane emission due to the addition of rice bran or steam flaked corn (corn) at a maintenance energy intake level. Methane emission per dry matter intake level (DMI) of Japanese Black cows fed rice WCS harvested at the yellow-ripe stage was 33L/kg DMI, which was higher than that of cows fed hay harvested at the flower stage (28L/kg DMI). However methane emissions per digestible organic matter or digestible energy were not significantly different between cows fed hay and cows fed rice WCS. Feeding 2kg of rice bran or corn, 30% of the ration with rice WCS decreased methane emission per DMI, and the degree of reduction for rice bran was larger than that for corn. Ruminal propionate proportions in cows fed rice WCS were lower than those for hay feeding. The addition of rice bran or corn to rice WCS increased the ruminal propionate proportion. Methane emissions from cows with a high ruminal propionate proportion tended to decrease. The results demonstrate that feeding corn or rice bran with rice WCS is effective for decreasing methane emission from cows.
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