Effects of Molasses and Agro-byproducts Compound Supplement on the Quality of Alfalfa Silage

The objective of this study was to find out the effects of adding different agro-byproducts,such as molasses,straw,wheat bran and rice bran on the fermentation quality of alfalfa silage.Results from the experiments showed that the silage which was added with molasses,was well-preserved,the sense quality,the content of crude protein and lactic acid were significantly improved,at the same time,the ratio of ammonia-nitrogen to total nitrogen and pH were reduced;the groups which were added with molasses were most significantly different compared with the control group(P0.01);The content of volatility fatty acid also declined,but there was no difference during the three groups(P0.05);There was most significant difference in the average lactic acid content and the average pH between the two groups with adding molasses(P0.01),while the other results had no significant effects;but in the same molasses levels,the results of the lactic acid content and the pH by adding straw were better than the wheat bran and rice bran(P0.01);there was no difference when not adding molasses,however the moisture content was the key,that is to say,the more the proportion of the agro-byproducts,the better the silage quality.