Abstract

‘Tachisuzuka’ is a new rice (Oryza sativa L.) cultivar for whole-crop silage (WCS) use. Agronomic characters were recorded from 2007 to 2009. The culm length of Tachisuzuka was 11 cm longer than that of Kusanohoshi. The short panicle of Tachisuzuka was morphologically similar to that of the short panicle 1 (sp1) mutant. Tachisuzuka exhibited high lodging resistance in the yellow ripening stage, the optimal period for harvesting, and a month after yellow ripening. The straw yield of Tachisuzuka was remarkably higher than that of Kusanohoshi but its grain yield was lower. A portion of grains are undigested and excreted in feces by cattle fed with rice WCS, and this loss of nutrients should not be disregarded. The low grain/straw ratio of Tachisuzuka indicates that the loss of nutrients in cattle fed with Tachisuzuka WCS should be lower than with Kusanohoshi WCS. Low sugar content of rice plants is considered a cause of silage deterioration. The sugar content of Tachisuzuka was markedly higher than that of Kusanohoshi.

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