Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of wilting and additives on the ensiling quality and in vitro rumen fermentation characteristics of sudangrass silage

  • Wan, Jiang Chun (College of Animal Science and Technology, China Agricultural University) ;
  • Xie, Kai Yun (College of Grassland and Environment Science, Xinjiang Agricultural University) ;
  • Wang, Yu Xiang (College of Grassland and Environment Science, Xinjiang Agricultural University) ;
  • Liu, Li (College of Grassland and Environment Science, Xinjiang Agricultural University) ;
  • Yu, Zhu (College of Animal Science and Technology, China Agricultural University) ;
  • Wang, Bing (College of Animal Science and Technology, China Agricultural University)
  • Received : 2020.02.11
  • Accepted : 2020.05.13
  • Published : 2021.01.01
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Abstract

Objective: This study was conducted to investigate the effects of molasses and Lactobacillus plantarum on the ensiling quality and in vitro rumen fermentation of sudangrass silage prepared with or without wilting. Methods: The ensiling experiment, measured with 3 replicates, was carried out according to a 2×4 (wilted stages×additives) factorial treatment structure. Dry matter of the fresh (210 g/kg fresh matter) or wilted (305 g/kg fresh matter) sudangrass were ensiled (packed into 5.0-L plastic jars) without additive (control) or with molasses (M), Lactobacillus plantarum (LP), or molasses + Lactobacillus plantarum (M+LP). After 60 days of ensiling, the silages were analyzed for the chemical, fermentation, and in vitro characteristics. Results: After 60 days of ensiling, the fermentation parameters were affected by wilted, the additives and the interactions of wilted with the additives (p<0.05). The M+LP treatment at wilted had higher lactic acid levels and V-score (p<0.05) but lower pH values and butyric acid concentrations than the other treatments. In comparison with sudangrass before ensiling, after ensiling had lower dry matter and higher non-fibrous carbohydrate. The in vitro gas production, in vitro dry matter digestibility, in vitro crude protein digestibility, and in vitro acid fiber detergent digestibility changed under the effects of the additives. Significant interactions were observed between wilted and the additives in terms of in vitro gas production at 48 h, asymptotic gas production, gas production rate, half time, and the average gas production rate. The total volatile fatty acid levels in the additive treatments were higher than those in the control. Conclusion: Wilting and supplementation with molasses and Lactobacillus plantarum had the ability to improve the ensiling quality and in vitro nutrient digestibility of sudangrass silage. The M+LP treatment at wilted exhibited the strongest positive effects on silage quality and in vitro ruminal fermentation characteristics.

Keywords

Acknowledgement

This work was financially supported by the National Forage Industry System (CARS-34), Grassology Peak Discipline Foundation of Xinjiang Uygur Autonomous Region, China; the Key Research and Development Program in Ningxia Hui Autonomous Region (2017BY082), the Agricultural Technology Test demonstration and Service Support Program in China (131821301064071005), the Natural Science Foundation of Xinjiang of China (2017D01B19), and the Scientific Research Program of the Higher Education Institution of Xinjiang of China (XJEDU2016S049); National Key R&D Program of China (2017YFE0109200).

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