Fecal excretion of undigested rice grain in cattle as affected by threshing and size of grain
2007
Shinoda, M.(National Agricultural Research Center for Tohoku Region, Morioka (Japan)) | Kushibiki, S. | Shingu, H. | Touno, E.
Fecal excretion of undigested rice grain was investigated in cattle fed grains in various conditions [different sizes, threshed vs. non-threshed (as panicle), intact vs. mechanically treated]. In Trial 1, cattle were fed rice whole crop silage of a large-grain or a middle-grain variety at a maintenance level. The proportion of undigested grain excretion to the intake was similar in the two varieties with values below 5%. In Trial 2, cattle were fed grass hay added with differently treated grains collected from rice whole crop silage. The excretion of undigested grain was lower in non-threshed grains (as panicle) than in threshed grains, in mechanically treated grains than in non-treated grains, and with a lower feeding level of hay. In Trial 3, cattle were fed corn silage or grass hay added with a mixture of air-dried rice grains of large-type (average weight=0.045g) and long-type (average weight=0.026g) varieties. The excretion of undigested grain was lower in the large grain (24%) than in the long grain (44%). The results show that digestion of rice grain in cattle is affected by threshing in silage feeding and by grain size in grain feeding.
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