Prediction of the voluntary intake of grass silages by sheep from rumen degradation measured by the polyester fibre bag or by gas production Morrin, M.J.; Rooke, J.A.; Offer, N.W.; Hovell, F.D.D. Animal Production 58(3): 456-457 1994 0003-3561 https://eurekamag.com/research/032/908/032908106.php