Effect of additives on fermentation quality and cattle rumen degradability of mixed potato pulp and corn straw silage

doi:10.11686/cyxb2017510

Abstract

Abstract: The purpose of this experiment was to investigate the effect of different additives on fermentation quality and cattle rumen degradability of a mixed silage made with potato pulp and corn straw, and to screen for suitable additives. The sealed bucket storage method was used in the experiment. The mixed storage ratio of sweet potato pulp and corn straw was 1∶2 and the moisture content was 70%. Five different treatments were assessed: a control (CK), Weizhu group (treatment 1), silage-help group (treatment 2), LaBaX composite additive group (treatment 3) and Yaxin group (treatment 4); each treatment was replicated 3 times and the storage period was 60 days. Laboratory chemical analysis and in situ technology were used to determine the fermentation quality, aerobic stability and rumen degradation rate on the 60th day.There were no differences between treatments in the sensory evaluation; fermentation quality of the missed silage was improved by the additive treatments; lactic acid content in treatment 4 was the highest (P<0.01) whereas the pH and ammonia nitrogen content in treatment 4 were the lowest (P<0.05). Aerobic stability was increased by all additive treatments with treatment 4 (162 hours) again the best (P<0.01). Rumen degradability of dry matter (DM) in the treatment groups was significantly higher than that the CK group (P<0.05); crude protein (CP) rumen degradation rate was also significantly higher than that in the CK group (P<0.01).The neutral detergent fiber (NDF) rumen degradation rate in treatment 4 was the highest, significantly higher than that of treatment 3 (P<0.05), but was not different to other treatment groups (P>0.05).The acid detergent fiber (ADF) rumen degradation rate of treatment 4 was significantly higher than that of treatment 3 and CK (P<0.05), but was not different from treatment 1 and treatment 2 (P>0.05).The rumen degradability of starch in treatment 1 was 2.83% (P<0.01) higher than that of CK. The rumen degradation rate of starch in other treatment groups were not different (P>0.05). In conclusion, the additives used in this study improved fermentation quality, aerobic stability and rumen degradability of mixed potato pulp and corn straw but the Yaxin treament produced the best quality silage.

Key words: potato pulp, corn straw, additive, fermentation quality, 48 h degradation rate

SHEN Rui-rui, LI Qiu-feng, LI Yun-qi, SUN Xiao-yu, CAO Yu-feng, YUE Kang-ning, WANG Yong-sheng, WANG Mei-mei, GAO Yan-xia, LI Jian-guo. Effect of additives on fermentation quality and cattle rumen degradability of mixed potato pulp and corn straw silage[J]. Acta Prataculturae Sinica, 2018, 27(11): 200-208.

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