Effects of microecological agents on the fermentation quality, nutrition composition and in situ ruminal degradability of corn stalk silage

doi:10.11686/cyxb2015511

Abstract

Abstract: A study has been undertaken to investigate the effects of probiotics on the fermentation quality, nutrition composition and in situ ruminal degradability of corn stalk silage. Green corn stalk without ears (dry matter=42%-44%) was chopped to 2 cm lengths and then 1 kg of chopped corn stalk was packed with additives (zymin, fungus-preparation, and a mixture of the zymin and fungus-preparation) in polyethylene bags (24 cm×40 cm) using a vacuum packager. After 45 days of fermentation at room temperature, the corn stalk silage’s fermentation quality, nutrition composition and in situ ruminal degradability were analyzed using laboratory chemical methods and in situ technology. The results showed that, compared to the control, the pH value and ammonia nitrogen (NH₃-N) content of the two lactobacillus (LAB₁ and LAB₂) treatments decreased (P<0.05), whereas contents of lactate acid (LA), organic matter (OM), water soluble carbohydrates (WSC), and the in situ ruminal degradability of DM, OM and crude protein (CP) increased significantly (P<0.05). The addition of lactobacillus increased WSC content (P<0.05) compared with the control and cellulase treatments. Compared with the control, the pH value, NH₃-N content, neutral detergent fiber (NDF), acid detergent fiber (ADF), and cellulose content of the cellulase treatments (CE₁ and CE₂) significantly decreased (P<0.05). Furthermore, the acid detergent lignin (ADL) content had a decreasing trend (P>0.05). The mixture of cellulase and lactobacillus treatments (MCL₁ and MCL₂) had the lowest pH value and the highest in situ degradation of NDF and cellulose compared with other treatments (P<0.05). In addition, in situ degradation of ADL increased but did not reach significance (P>0.05). Compared with the control, the NDF, ADF and cellulose contents of the cellulase and lactobacillus mixture treatments significantly decreased (P<0.05). In conclusion, the application of cellulase and lactobacillus mixtures to the fermentation of corn stalk contributed to the breakdown of lignin-cellulose-hemicellulose composite structures and the improvement of fermentation quality, which consequently resulted into high nutrient digestibility and utilization efficiency. The MCL₂ treatment had the best effect in this regard.

TAO Lian, FENG Wen-Xiao, WANG Yu-Rong, DIAO Qi-Yu. Effects of microecological agents on the fermentation quality, nutrition composition and in situ ruminal degradability of corn stalk silage[J]. Acta Prataculturae Sinica, 2016, 25(9): 152-160.

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