4Owens V N,Albrecht K A,Muck R E,et al.Protein degradation and fermentation characteristics of red clover and alfalfa silage harvested with varying levels of total nonstructural carbohydrates[J].Crop Science,1999,39(6):1873-1880.
5Playne M J,McDonald P.The buffering constituents of herbage and silage[J].Journal of the Science of Food and Agriculture,1966,17:264-268.
6Broderica G A,J H Kang.Automated simultaneous determination of ammonia and amino acids in ruminal fluid and in vitro media[J].J Dairy Sci,1980,33:64-75.
7Hristov A N,Sandev S G.Proteolysis and rumen degradability of pro-tein in alfalfa preserved as silage,wilted silage or hay[J].Animal Feed Science Technology,1998,72:175-181.
8Carpirero C H.The effect of some pretreatments on proteolysis during the ensilage of herbage[J].Grass and Forage Science,1979,34:311-315.
9Kennedy S J.Comparison of the fermentation quality and nutritive value of sulfuric and formic acid treated silage fed to beef cattle[J].Grass and Forage Science,1990,44:371.
10Phillip L E,Underhill L,Garino H.Effects of treating lucerne with an inoculum of lactic acid bacteria or formic acid upon chemical changes during fermentation,and upon the nutritive value of the silage for lambs[J].Grass and Forage Science,1990,45:337-344.
