Ruminal disappearance of PAHs in contaminated grass using the nylon bag technique Adrián Costera, Guido Rychen, Cyril Feidt, Claire Soligot and Stefan Jurjanz Agron. Sustain. Dev., 30 4 (2010) 769-775 Published online: 17 June 2010 DOI: 10.1051/agro/2010010