1Qrskov E R. Protein Nutrition in Ruminants [M].London: Academic Press, 1992.
2Ganev G, Qrskov E R,Smart R.The effect of roughage or concentrate feeding and remen retetion time on total degradation of protein in the rumen [J ].J Agric Sci,1979,93: 651-656.
4Chalupa W,Sniffen C J,Fox D G,et al.Model Generated Protein Degradation Nutritional Information[M].Proc.Cornell Nutr Conf,Department of Animal Science,Cornell University,Ithaca,NY,USA,1991.44-51.
5Sniffen C J,O'Connor J D,Van Soest P,et al.A net carbohydrate andprotein system for evaluating cattle diets:Ⅱ.Carbohydrate and protein availability[ J ].J Anim Sci,1992,70:3562-3577.
6Helplund T,Wwisbjerg M R.In vitro techniques to replace in vivo methods f or estimating amino acid supply[J ].Brit Society Anim Sci,1998,22:131-144.
7Lebzien P,Voigt J,Gabel M,et al.Zur Scha tzung der Menge an nutzbarem Rohprotein am Duodenum von Milchk ü hen[J].J Anim Physiol Anim Nutr,1996,76:218-223.
8Lebzien P.Zum Einfluss des Futterproteins auf dasAminosa urenmuster des Proteins am Duodenum yon Wiederka uern [J].ü bers.Tiererna hrg,1997,137-153.
9Zhao G Y,Lebzien P.Developent of an in vitro incubation technique for the estimation of the utilizable crude protein (uCP) in feeds for cattle[J].Arch Anim Nutr,2000,53:293-302.
10Tilley J M A,Terry R A.A two-stage technique for the in vitro digestion of forage crops[J].J Brit Grassl Soc,1963,40:139-155.
