Effect Of Adding Different Absorbent On Beet Silage Quality And Aerobic Stability

The study was to evaluate the effect of adding different absorbents on the fermentation quality and aerobic stability of beet silage. The purpose is to find a suitable absorbent,which is too low and easy to get , to improve the beet silage fermentation quality and nutrition value.Test 1 Carbohydrate composition of the fresh beet pulpThe carbohydrate contents of the beet pulp are consisted of cell wall and cell contents. Among the cell contents, the organic acids accouted for 0.48%, sugar was 4.82% and starch was 2.98%. In the cell wall, which was consisted of the NDF, was 49.62%, and the rest such as the pectic substances, which was 14.17%, and fructans were composed as neutral detergent soluble fiber (up to 30.28%). It can be seen that beet pulp was rich in the non starch polysaccharide, up to 79.90%.Test 2 The beet pulp silages with different absorbentsThis study was adopted by Single factor design. There were five treatments, and each of them had 18 repeats (15 of them repeats were for the 5 stages to quality testing during silage.). The pods, rice straw, corn stovers and wheat bran were in accordance with the 4:1 ratio to beet pulp, making its water 70%. The control did not add anything to silage.The results showed that: duiring the silage, all the treatments had not a big change in pH value. But the NH₃-N was always increasing, especially the control, which was significant difference between treatments (P < 0.05). After silage, adding the absorbents could slow down the degradation rate of protein, and were significant with the control (P < 0.05). Ammonia nitrogen in the bran was the smallest proportion. Among all these, the content of lactic acid and acetic acid were significant seperatly (P < 0.05). Acid content in each treatment was not significant (P > 0.05). The rice straw and pods were not detected in acid, and others were not significant (P > 0.05).On the other hand, adding the absorbents to the beet pulp silage could reduce the dry matter loss. The dry matter loss were significantly different (P < 0.01), when the dry matter loss in control loss was 20.76%, the bran treatment was only 1.59%. Similarly, the five treatments could have a significantly different in the loss rate of WSC (P < 0.05). The control was the most serious, up to 92%.Test 3 The aerobic stability of the beet pulp silage with different absorbentsAfter 70 days, all the treatments were exposed to the air. It was shown that the control was in the unaerobic stability state after three days, that was to say, it was only 96 hours. The corn stalks delayed one day. The aerobic stability of the pod was the highest, up to 216 hours.Test 4 Determination of the degradation rate of DM, CP, NDF at different time points in the rumen This study was to determination these five different beet silages in the rumen DM, CPand NDF degradation rate by nylon bag method. The results showed that, the controlhad ahighest effective degradation of DM at 65%, followed by wheat bran (58.27%); the control of NDF degradation rate was still at the highestwhich was 55.82%, followed by wheat bran (44.59%). And the rate were 19.87%, 33.03%, 20.70% in turn in rice straw, corn stalks and the pod; the CP degradation in the bran was the highest(74.30%).This experiment showed the following conclusions:(1)The nutritional characteristics of the beet pulp: the high soluble fiber. From the rumen degradation, it also could be thought as a easily degradable substance.(2)It showen that beet pulp which was at low dry matter was in poor fermentation quality and had more effluents. Adding absorbents (such as rice straw, corn stover, pods and wheat bran) to the beet pulp silage couls better improve the quality. It can to some extent reduce NH3-N and the loss of WSC and reserve the dry matter and CP content. In the other hand, it also delayed absorbent secondary fermentation of silage.(3)Considing all the aspects, especially the econoimy, this study pointed out that the beet pulp silage with 20% dry rice straw as the best, followed by adding 20% dry pods.