3Sadasivaih R D, Weijer J. Cytogenetics of some natural intergeneric hybrids between Elymus and Agropyron species [J]. Cana J Genet, 1981, 23:131-140.
4Barry T N, Manley T R. The role of condensed tannins in the nutritional value of Lotus pedunculatus for sheep(Quantitative digestion of carbohydrates and proteins)[J]. Br Nutrition, 1984, (51):493-514.
5McDonald P. The Biochemistry of silage[M]. NewYork: John Wiley&Sons,Ltd., 1981.
6Salawu M B, Acamovic T, Stewart C S, et al. The use of tannins as silage additives:effects on silage composition and mobile bag disapperence of dry matter and protein [J].Anim Feed Sci Technol, 1999, (89): 243-259.
7Reed J D. Nutritional toxicology of tannins and related polyphenols in forage legumes[J]. Anita Sci, 1995, (78): 1766-1773.
