PJB-2021-657
EFFECT OF EXOGENOUS BIOLOGICAL AGENTS ON SILAGE QUALITY AND RUMINAL DEGRADABILITY OF RICE STALK AND POTATO PULP MIXED SILAGE
ZHENG HAIYAN
Abstract
The object of this study is to research the effect of exogenous biological agents on silage quality and in situ ruminal degradability of rice stalk and potato pulp mixed silage. Rice stalks were chopped and then packed in polyethylene bags and mixed with potato pulp at ratio of 3:1. Fermentation quality, nutritive value and in situ ruminal degradability of Longjing 31 rice stalk mixed silage with Kexing 1 potato pulp were analyzed using laboratory chemical methods and in situ technology after 60 days. There were 15 exogenous biological agent treatments which used randomized complete experimental design. Sensory evaluation of all the treatments were superior grade. The content of lactic acid of MCL2 treatment (xylanase 1 g/3 kg, β-glucanase1 g/3 kg, pectinase 1 g/3 kg, lactobacillus 3 g/3 kg, cellulase 1 g/3 kg) and MCL4 treatment (xylanase 1 g/3kg, β-glucanase1 g/3 kg, pectinase 1 g/3 kg, lactobacillus 3 g/3 kg, laccase 1 g/3 kg) were the highest, and dry matter (DM) was 3.82 and 3.78%, respectively (P<0.05); Enzyme preparation treatments and enzyme mixed fungus preparation treatments decreased neutral detergent fiber (NDF), acid detergent fiber (ADF) and cellulose, which MCL2 treatment were the lowest, and DM was 51.21, 30.46 and 20.75% respectively (P<0.05); Ruminal degradability of 72 hours of five treatments (CE1, CE2, MCL2, MCL6, MCL7) which cellulase addition amount was 1 g/3 kg were higher than other treatments. Generally, exogenous biological agents promoted fermentation and increased the nutrient storage of rice stalk and potato pulp mixed silage, and improved the ruminal degradability for ruminant. The effects of exogenous biological agents from great to small were enzyme mixed fungus＞enzyme＞fungus treatments. The silage quality and ruminal degradability of the treatment MCL2 was the best combination. Cellulase decreased cellulose, NDF and ADF, 1 g/3 kg was the best incubation amount.
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