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Schematic of the different BSi fractions in grass and the relative change in BSi fractions after digestion by herbivores. Non-extractable Na2CO3 fraction (NCI-BSi) is depicted as a white bar, Na2CO3 extractable fraction as a black bar and mobilization of DSi in urine as a yellow bar. As part of plant ingested Si in herbivores is released via urine, the relative portion of NCI-BSi is larger in faeces as compared with hay or grass.
