9Uden P.The influence of leaf and stem particle size in vitro and of sample size in sacco on neutral detergent fibre fermentation kinetics. Animal Feed Science Technology. 1992,37: 85.
10Pedersen B. ,Eggum B.O.Prediction of protein digestibility by an in vitro enzymatic pH slat procedure[J].Zeitschrift fur tierphysiologie,tierenahrung and fttermittelkunde. 1983,49:265 - 277.
